The only way I’d be okay with a X/XI/XII and beyond is if Kylo has offspring that the next trilogy focuses on. Numbered saga films should be about the Skywalkers at this point, otherwise they should be a separate series that isn’t Episode X/XI/XII.
Of course, if Lucas hadn’t made I-VI into “The Saga of Anakin Skywalker,” I’d be fine with IX being the last we see of the Skywalker bloodline, with X-XII having nothing to do with that family. But since that’s what the movies turned into, there’s no reason not to begin a new saga that isn’t Episode X+ if they aren’t continuing the Skywalker family past Kylo.
I agree. I think a fourth trilogy could be based around Rey, Ben, and their kids.