I really believe that Booker can be the best player on a championship team some day. Even if he has reached his plateau offensively (which may or may not be true), he can be borderline unstoppable at times. Bridges, Ayton, and Johnson are excellent complementary players who will all get better.
Their management will have to figure out how to build around that group with limited cap space after Paul ages out, but that’s an awfully nice core to work with.