Xbox's Phil Spencer isn't sold on making a mid-generation "pro" version of the Xbox Series X. Speaking with Rolling Stone, he ...

if you’ve experienced issues playing on your Xbox 360 or running backward-compatible titles on Xbox One or Xbox Series X|S, you’ll need to be patient and wait for services to be restored.

Black Ops 6 Direct - YouTube This suggests we'll have to wait a while for an Xbox Series X follow-up, although better news is that whatever comes next will at least be backward compatible once more.