QUIC has not yet been fully standardized. If you integrate a current draft you risk that your claimed QUIC support is broken 1 year from now. Google risks that,

QUIC has not yet been fully standardized. If you integrate a current draft you risk that your claimed QUIC support is broken 1 year from now. Google risks that, because they control all parts of the system (services & brower). However I generally agree that HTTP/2 might only be short-term milestone on the way to HTTP over QUIC, as only this really fixes head-of-line blocking and therefore maybe justifies the increased implementation complexity better than HTTP/2.