Consider the odds of being born. What makes you, you, is the product of one sperm, and one egg. If your parents had not have had sex when they did, that specific sperm would not have merged with that specific egg. Even a difference of five minutes in either direction might mean that a different sperm "win" and thus the product is a completely different person.

Now, imagine how many people were killed by the Narada, and how much work and restructuring of the Federation are represented by the destruction of Vulcan.

So, I'm not saying that "TNG" won't happen, but statistically it's extremely unlikely that the exact events that produced all of the characters of the TNG era still happen in order to produce those same characters. So, while Picard's parents might still meet and have children together, unless the entirety of their lives are entirely unaffected by the events of the movie, it is very unlikely that they will produce Jean-Luc and Robert as we know them.

And the same goes to pretty much every character in TNG. This is why a lot of time travel stories kind of fall flat, because if you have major impact on the past, the future will be extremely altered on an individual basis, as the circumstances surrounding the conception of many many people would likely be subtly altered, producing an entirely different set of individuals.