It just occurred to me about the Kelvin verse and the Prime verse. There is no difference.
According to the Kelvin movie, Nero traveled back into time in the Prime verse. He destroyed Vulcan.
He altered events in the prime universe. He didn't create a whole separate reality in another dimension.
So in the future in the prime verse, Vulcan no longer existed. TNG should have noted it. DS9 should have noted it.
Its not a separate universe.... It's the same universe!
*sigh* No, for the five millionth time, that is not the intent. The Kelvin timeline
branched off from the Prime timeline; it did not erase it. It's nonsensical to think that the creators of the movies wanted to eliminate the Prime timeline from existence. CBS would never have
let them do that, and the very fact that
Discovery exists in what's unambiguously a separate timeline from Kelvin (because there was a Klingon war in 2256-7 when STID says there have only been a few minor skirmishes as of 2259, and the
Enterprise is already in service in 2256-7 while the Kelvin version isn't launched until '58) proves that Prime still exists.
And yes, decades of time-travel fiction has brainwashed us to believe that altering history "erases" the original timeline, but that's physically impossible and logically contradictory. The writers of ST '09 chose to employ a more scientifically credible model in which the new timeline coexists
alongside the old one, both because it's more scientifically up-to-date and because it lets both timelines coexist and continue to have stories told in them.
For that matter, there's already canonical precedent in "Yesteryear" -- when Spock goes back in time to restore his own timeline, he says he hopes Commander Thelin lives long and prospers in his own timeline -- which he would not say if he expected Thelin's timeline to be erased when he restores his own. It's implicit that the two different timelines coexist rather than overwriting each other. As reinforced by "Yesteryear"'s opening log entry describing the Guardian of Forever as "the focus of all the timelines of our galaxy."
I still say the key tipping point was ENT. Sure, the Canon Debates were always there, but they didn't multiply until Star Trek began doing prequels.
As I've been saying, this is not true; there were always fans who objected to the perceived continuity errors in sequels like the movies and TNG, who refused to accept the redesign of the Klingons or the other reinterpretations of the universe. The change to prequels just shifted the topic of the objections. It didn't change human nature, the inability of some people to accept anything that challenges their preconceptions and assumptions.
Not to mention that some fans will attack any difference whether it involves continuity or not. When
Voyager came along, there were vicious misogynistic attacks on Janeway. I'm sure there were racist reactions to Sisko when DS9 came along, but I think that was before I got involved in online bulletin boards.