For the record, just to add some weight to what @b.mac said about a potential replacement timeline, early Nov. 2024 is PLENTY enough time to get a major coaster on the books for a Spring 2026 debut. I'd be shocked if that weren't the plan.
2025 will be rough for the park (a low capacity, delayed-from-2024 shuttle coaster won't come close to compensating for all the loss SFGAdv is reportedly about to incur), but they definitely have the ability to do something huge in time for 2026. Comparisons to Volcano and Dragster probably aren't super warrented because both of those coaster closed unexpectedly and against the chain's wishes. Six Flags is reportedly, actively deciding to close Ka (and friends) this year—so there really wouldn't be any excuse for not having "compensation" ready to go by 2026. In fact, I can't imagine them making moves this large without that being an explicit part of the plan.
None of that, of course, excuses how Six Flags is handling the PR side of this, but the timelines probably make sense.
To add to this some of these decisions are being forced upon by corporate, some of them are rides being naturally at the end of their life cycle, and some are just the park deciding to rip the band-aid off. I will elaborate more at a later time but I have already shared the details with Zachary via DM.