Still worth buying a series x this late in the generation?

If it's mostly going to be Game Pass, have a look at the Series S as well, it's a lot cheaper. The catch is small storage and no disc drive, and the expansion cards aren't cheap, so add one to the price before you compare the two.

Depends a lot on what you already own. If you don't have a gaming PC and Game Pass is the appeal, it's still a really good box and the library is huge at this point. If you do have a decent PC though, most of the first party stuff lands there too, so the Series X mostly becomes a couch convenience thing. Same if you're mainly after one or two exclusives, check whether they're coming to other platforms first because a lot of them have been. What would you mostly be playing on it?