Angular is basically headed down the same path that Ember went down IMO. A stable & mature but declining framework.
The same could ultimately happen to React as well. I'm working on a new project right now using Remix, which is great, but I've also realized that really nothing I've done wouldn't have worked just as well without React. Fortunately I really enjoy Remix, but if SvelteKit or SolidStart provide a similar experience I don't really see why I would stick with React.
Technically yes but just because they have a scheduled major release every 6 months doesn’t mean you’re going to see significant breaking changes. They’re not as conservative as Ember in that regard (still on 3.x!) but relative to React, Vue, etc things aren’t changing as quickly.
The same could ultimately happen to React as well. I'm working on a new project right now using Remix, which is great, but I've also realized that really nothing I've done wouldn't have worked just as well without React. Fortunately I really enjoy Remix, but if SvelteKit or SolidStart provide a similar experience I don't really see why I would stick with React.