Considering Star Trek Voyager's S2
Futures End which took place in 1996 and showed an Earth, and not a war ravaged Wasteland where whole populations had been bond out of existence; I'm amazed you just now posit the idea that the prime Star Trek timeline no longer exists.
Then there's Star Trek First Contact, and ENT S2
Regeneration which both contradict what was shown in TNG S2 Q Who, where data flatly tells Picard that the Federation has never encountered cybernetic organisms like the Borg before: and then there's Anika Hanson's (aka 7 of 9) parents, two Federation scientists who are following a borg Cube 20 years before the events depicted in TNG
Q Who...
Yet only now after this particular Star Trek franchise episode, you're ready to declare the Prime Yniverse timeline dead...
(And believe me there are plenty more examples from the Berman era of Trek, but I think the point has been made.)