If you are really seeking to replace WSGI, then I'd encourage you do a bit more research, write a specification, get at least one more implementation, and then submit it as a PEP.

Documenting at this level is challenging & rewarding. The hard part about specification work, beyond explaining the design and providing adequate justification, is getting consensus. By doing so, you'll learn quite a bit, open yourself up for critique, and in the end perhaps provide a credible alternative.