If 1914, 144,000, and this generation were dropped...
Which generation?
The generation that saw 1914 or the subesquent overlapping generations?
They've changed the "generation" teaching at least three times since the early 90s. While it caused some of us to sit up and take note...and even leave...the core group is still there.
Some even have said that if there was a change to these that it wouldn't bother them.
There's your answer. It wouldn't bother them.
Fact is, most dubs don't really question doctrine, they just accept what they're told. Early on a recruit may question so as to understand but once someone is fullly indoctrinated they pretty much shut down the critical thinking abilities and just become drone robots following the counsel of the WTS.
We were debating the 1914 thing on another thread and while there is disagreement as to if the WTS will ever drop it, it was pretty much agreed that to the hardcore dub, they'll accept whatever mother tells them to accept.
What would happen if these teachings were abandoned? Could the rest of the "truth" still hold up? Or, are all somehow related to these 3 things?
The "truth" can't hold up now, with or without those teachings. Not all JW teachings are related to those things, but it can be argued that the core teachings, the very cornerstone of the religion is based on those teachings, but as has been the case before, as the WTS changes directions, most of the followers go along with them. Even when they lose some, they replace them with new recruits and born-ins.