I think the PS5 should be a home/handheld hybrid, but I doubt they will do it.
Sony should release a PS5 and a PS5GO. The GO version would play every game in a downgraded way (the inverse of a PS4PRO).
If this happens I expect Sony to release it 1 1/2year after the launch. So that people wont bit(h about why it is not a hybrid console.