I think that QUIC and HTTP/3 are great, but I worry that HTTP/1.1 will eventually be abandoned. I think it's important to be able to implement basic HTTP functionality with a few lines of code.
HTTP/2? Sure HTTP/1.1? Not a chance. It's too widespread and too valuable, and the floor is too low. Unless Google starts a singular effort against it and manages to pull in the other big cos while avoiding the ire of the liberal states, which seems unlikely.