I'd suggest you read Christopher's comments regarding canon & continuity in the thread below. Some of the expressions you use - schisms in the fandom, black pill scorched earth - sound a tad extreme in this context, so a reevaluation of the issues you see might help getting to a more relaxed perspective.
https://www.trekbbs.com/threads/are-novels-canon.311982/page-2
Of course they can. Do TWOK and TSFS exist in separate continuities because they changed who plays Saavik?
On canon vs continuity plus recasting... continuity changes and retcons post 2017 are orders of magnitude more extensive than anything pre-2005. Changing Saavik is annoying... throwing out the entire visual continuity of TOS, especially when it is integral to the Berman era continuity as well, is well, bound to be polarizing. Again, going the multiverse route seems like the best option. Can you imagine if Berman and Braga had done something similar with ENT vs TOS?!? It would be inconceivable.
On the black pill and scorched earth terms... The anti-Kurtzman Trek people aren't a unified whole. Three of the major opposition fandom YouTubers have come out this week condemning Robert Meyer Burnett for supporting Picard season 3, arguing either he's a shill, biased because he could be friends with Terry Matalas, or that -- even if it's the best season of Star Trek ever -- it still needs to be burned to the ground and boycotted because it could further Kurtzman's hold on the franchise. The more moderate opposition fans use the general term "black pills" to describe this mentality, which is more often applied to Marvel and Star Wars fans, say with Ms Marvel and Obi Wan Kanobi series. The more moderate opposition fans feel that their concerns are being gradually reflected in Hollywood office politics, with Bob Chapek and David Zaslov gradually asserting control at Disney and Warners respectively and moderating on more polarizing content.
The only reason I got back into Kurtzman Trek this year was because of Terry Matalas' involvement in Picard season 2. Granted maybe Akiva Goldsman and the Secret Hideout interns shouldn't have made a mess of it, but as a whole the season is at least watchable. Terry is supposed to have full control over season 3.. brought in his own people to write, edit, score the music, even brought in many Berman Trek veterans. I like Terry's history with the franchise. I want his potential pivot to succeed. It would be great to get more 24th century show follow ups with him at the helm. The next next generation with evolution, not massive misfires like trying to reinvent a wheel but forgetting it should be I dunno, round?
Check out the 12 Monkeys series if you haven't had a chance. It's really well written, nothing like a CW soapy melodrama, to see what he's capable of as a showrunner.
There has always been a schism in the fandom between purists who hate the new product and those who enjoy the new product. This isn't something that just manifested in the past five years because of Disco and all the other CBSAA/Paramount+ shows. It's been a thing since at least the release of the TOS movies.
I'd say as a percentage, many many more more are alienated now than at least once TNG hit it's stride running into the VGR / ENT doldrums. Yes, yes people complained about ENT. But the constraints of UPN are very different than the massive changes that have presented from STD onward.
I don't think anybody is worried about healing any schism here. I think most folks figure you're impossible to please, shrug and move on.
As long as they don't turn it into another TATV with Michael Burnham, Picard season 3 will likely mostly please me I think. Extra credit for somehow showing a TOS Constitution class ship and not a Discoprise, and only Klingons, not KlingOrcs.
I really liked the season 2 opener, which had Terry's greatest involvement. Now that actually felt like Star Trek! Prodigy is surprisingly watchable for a kid's show. And Lower Decks is at a minimum 60/40 for me.
