There's a huge difference between Trek lit becoming non-canon and Star Wars lit becoming Legends.
That's my impression as well. I'm not nearly as big a Star Wars fan as Star Trek (I've only seen the movies) but have heard about what Star Wars feels is 'canon' compared to Star Trek. Other posters have noted there are some similarities with Star Trek. But Star Wars had a tiered canon system at one time. Even considering some tie-ins 'canon until they're not' is more than Star Trek ever did. In Star Trek tie-ins weren't any level of canon. Most of the time they weren't even considered. Whereas in Star Wars, at least at one time, the tie-ins were at least given some consideration, even if they were ignored. Star Trek never even went that far.
Now the current show runners have at least indicated a willingness to review tie-in fiction, which is more I think then prior show runners which barely acknowledged tie-in's existence (outside a rare exception now and again). But I wouldn't attach any hope that the current show runners will give significant consideration to the novels.
I know some Star Wars fans that were quite upset almost the entire tie-in universe was abolished by The Force Awakens. Star Trek fans, on the other hand, know our tie-ins are always at risk of being overwritten. I think it's a testament to our novel writers that despite knowing the facts of life of the situation, that there is still a bit of angst that the new Picard show may lead to an end of the current relaunch novels. Christopher, Greg Cox, David Mack, KRAD, pretty much every author that posts here have noted in their own comments that it really doesn't bother them because they know that's part of the game. As Christopher has noted, they were given the keys to the car, or allowed to play in the sand box, but they don't own it. The owner can take the car in another direction any time they want.
Does it bother me? Yeah, a little. Even though I know all that, even though I'm looking forward to more onscreen adventures of TNG, a show I loved, I've loved the ongoing narrative in the relaunches and will still be sad to see it end in its current form. Again, a testament to all the writers that have contributed to that storyline. I've come to care about the litverse characters almost as much as the original characters. Chen, Elfiki, Taurik.....I've come to think of all of them (and the litverse characters on DS9, Voyager, Titan and Enterprise as well) as almost as important as Picard, Worf, Riker, etc. The novel writers have done an excellent job bringing those 'new' characters to life.
Part of me would love it if they decided to continue to litverse as an alternate universe. I'd love to have all the new shows and to see TNG, Titan, DS9, Voyager and Enterprise (and New Frontier for that matter) continue in the novels at the same time. But I also know that would be unprecedented for Star Trek...to continue an ongoing series that does not line up with canon. Could they? Sure, they can do anything they want. And Star Trek has actually provided a basis for that in canon, particular with "Parallels" but also with Star Trek (2009) among other stories. But it won't happen.