BluesBrother I notice you said the following regarding the JWs. "They have dropped the prophetic patterns of the Fred Frank era and take the Bible more as it says ...". If the WT/JW's are doing that (and it appears to me that the WT literature is now doing that), I think that is a good thing. It means they have stopped promoting much of their wild ideas, ideas which go far past what the scriptures say and mean, and it thus means their teachings are more in harmony with the Bible. It also means they becoming more mainstream as a result.
If they are more mainstream, then their religion may last longer (good from perhaps the WT's perspective, but not from the perspective of those of us who want the religion to soon cease to exist). If they ditch the erroneous date of 607 BCE for the destruction of Jerusalem, and if they ditch the what they teach regarding 1914, 1918, and 1919 in regards to purported supernatural events, then they will be even more mainstream and much less sectarian, more in harmony with the Bible and reality, and thus receive much less criticism. Perhaps they will end up doing such.
M. James Penton (a professor History and Religious Studies, who is also an ex-elder and an ex-JW) in his book called APOCALYPSE DELAYED: The Story of Jehovah's Witnesses" says something which I think is relevant to the above. On page 7 of the hardcover edition which was reprinted in 1986 he says the following.
"In an important way, though, Jehovah's Witnesses are unique; they have preached millenarianism longer and more consistently than any major sectarian movement in the modern world. Millenarianism has been a phenomenon common to many movements over the centuries, but in its purely religious form at least, it generally had to be played down, spiritualized, or abandoned within a relatively short time. ... Thus, the ordinary pattern has been for millenarian movements to surrender, ignore, or modify significantly their millenarian teachings - as has happened with the Seventh-Day Adventists, Latter-Day Saints, and many fundamentalists - or to become rather isolated within society - something which has taken place with the Christadelphians.. Surprisingly, this has not happened to Jehovah's Witnesses who, in spite of many prophetic failures and vicissitudes for more than a century, have gone on preaching the nearness of the millennium and have grown to become a movement with nearly 2.7 million active members and several millions more adherents throughout the world."
In pages 8 - 9 of the book Penton says the following. "In many ways the Witnesses have become ossified. ... More and more they have become hostile to new intellectual developments, the intellectual world, and to independent-minded intellectuals in their own ranks. And more significantly, their leadership has become a self-perpetuating caste which refuses to open itself to new and constructive criticism of almost any sort. ... Furthermore, an aging leadership seemed incapable of developing anything like a satisfactory response to what had not happened in 1975. ...while their essentially Adventist millenarianism has long been the basis of their growth and success, it is also their greatest weakness. Since, for over a hundred years, the end of this world has been delayed for them - something which they never expected would happen - they have not been able to adjust satisfactorily to world events or to a world which, in their view, goes 'groaning on.' "
There are number of ways the WT is solving some of the weaknesses mentioned by Penton and thus becoming more mainstream and thus more sustainable ideologically. In evidence of that consider the following.
Their books (the ones ones used for conducting Bible studies with non-JWS) made in the past 10 years or so, have greatly reduced the emphasis on 1914, 1918, and 1919. They also have stopped sharply directly criticizing the United Nations organization, and they urge JWs to adhere to the Covid-19 safety rules of the secular governments of the world. This shows they are reducing their conflict with government, at least in those countries which allow freedom of religion and which allow people to not join a military.
The WT has given more freedom for JWs to more types of blood fractions, and it allows JWs to have their blood salvaged and circulated through a machine during surgery. That makes a prohibition on blood transfusions much less problematic.
They now rarely disfellowship or label as disassociated JWs who have become 'faders' from the religion. That policy makes it much easier for those who stopped believing in the JW religion to essentially cease being JWs and at the same time still associate with their JW family members and to still get along with them.
They have sharply reduced the amount of field service time which JWs are required to do to remain considered as active JWs.That makes it easier for people to be JWs and is much more like mainstream Christianity, since most of non-Christianity does require its members to preach to others.
They have stopped saying the creative days of Genesis were 7,000 years long, and now say they could have been considerably longer. They have shifted their arguments from the old style type of creationism (involving a young biospehere of less than 49,000 years) to Intelligent Design type of arguments of biblical creationism (the form of biblical creationism which is the most in harmony with modern science), thereby being somewhat less in conflict with paleontology and evolution.
Their 2013 revision of the NWT is much more like the Bibles of mainstream Christianity (such as the NIV and the NRSV) and thus will likely appeal more to non-JWs.
If they switch their name from "Jehovah's Witnesses" to "Witnesses of Jehovah and Jesus" they will become even more mainstream (and have a more Bible based name) and thus be even more successful in attracting non-JW Christians to the religion. But they would have to go even further. They have to teach that all faithful Christians around the time of Armageddon will go to heaven and be there at least during the battle of Armageddon, if not also during the 1,000 years. They can teach that the faithful Christians will be back on Earth after the 1,000 years, in harmony Revelation chapter 21.