The saying goes "Once the good news of the kingdom has been preached in all the inhabited earth, then the end will come." (something like that)
Now, only 6,000,000 witnesses, one planet of 6,000,000,000 people, (the jw's amount to 0.1% of the earth's population, man sure annoying for only 0.1%) I don't see, how it would be possible to reach every person or land. So many new being born in the world, new subdivisions going up in every city across the planet, conceivably the cycle will never end, therefore the "good news" will never reach everyone.
And, a few threads of late regading going out in service, most people hate it, do as little as possible, count excess hours (donuts, driving time, etc.)
Could it ever come close to be being completed ???
Do you think the Watchtower will stop it (temporaily), to scare everyone and increase donations ???