At some point over the next decade or two, they will have to address the issue of the 144,000. I'm sure that they will have to admit that it is a figurative number, which is how it is presented in Revelations.
12 is one of the perfect numbers, like 7 and 10. 12 tribes, 12 months, 12 apostles, etc.
1000 is another multiple of a perfect number 10X10X10 = 1000
12 x 1000 = 12,000 a multiple of two perfect numbers
12 x 12,000 = 144,000 a multiple of 3 perfect numbers.
From the description of the 144,000, it would seem that the writer is trying to say that it was a huge gathering, but not unlimited, with representatives from all the tribes of Israel, God's chosen nation. The whole thing is figurative.
The issue of the value of 144K has long been questioned. Since several hundred thousands of early Christians were massacred by the Romans for 300 years, and then all of the free-thinkers and heretics of the times of the Catholic Inquisitions - easily were in the thousands. The new DVD tries to include men like Luther, Zvingli, Tyndale, Wycliffe, Newton, and Calvin in amongst the "true followers of Christianity" (questionable on many levels), then you have to include their followers and people like the Anabaptists and Hugenots.
There was absolutely no Biblical support for 1935 being the cutoff date for the chosing of the Anointed - and there really isn't any for the hard number of 144,000. Plus the 144,000 were all supposed to be male virgins and the children of Israel (Jewish).
I really think that we will see some sort of revivalist or reformation movement in the WT sometime in the future.