nginx doesn't support http2, apache too.. So maybe it's time to make some efforts to implement it on servers first. Maybe make some donations to apache, nginx dev. teams to speed up this process.
This is my real worry, at least nginx supports SPDY so has a base to evolve from, Apache support appears to be in a really bad place last time I checked.
The two most largely deployed servers on the Internet don't have HTTP2 support so their experience implementing and using it was never factored into the protocol.
MS seem to be doing a good job of building it into IIS, Traffic Server has it, as does H2O, nghttp2 and others.
Google, FB, Twitter, Akamai have adapted their http daemons for it.
nginx has SPDY support so HTTP/2 should be forthcoming but I wonder if this will be the death of Apache - they didn't seem to be able to update the SPDY plugin to 2.4
