This is a bit of a misunderstanding.

We are not sunsetting Pages. We are taking all the Pages-specific features and turning them into general Workers features -- which we should have done in the first place. At some point -- when we can do it with zero chance of breakage -- we will auto-migrate all Pages projects to this new implementation, essentially merging the platforms. We're not ready to auto-migrate yet, but if you're willing to do a little work you can manually migrate most Pages projects to Workers today. If you'd rather not, that's fine, you can keep using Pages and wait for the auto-migration later.