If the core of the argument is the generation, "truth" would boil down to Jesus' words , so:
It is a generation that will pass away ! just "--not until all -- has -- happened." therefore,
it must be a generation that survives Armageddon. but then dies.
according to wt doctrine: that are those who become wicked after Armageddon, in the new system, perhaps during the post - millenium rebellion.
the overlap takes wt to 2075. the 'death after Armageddon' that Mathew's writings require: 1000 years into the future: 3075.