Gentoo still has their own init, some distributions still use sysvinit, and both can run GNOME. Upstart is a dead project AFAIK, and the developer dropped it and said it was strictly inferior to systemd. ALSA is just the kernel layer, there is a limit to what you can put there, so some of it has gone into another layer in userspace, that's by design in the kernel. I won't comment on the display system, everything that needs to be said there has already been said in the other 700 comments here. I also wish this stuff went faster but unfortunately it takes time to do real work.

I'm not sure what you mean by consensus, if there was consensus on everything then we wouldn't have so many Linux and BSD distributions. We'd probably have just one or two, and you'd probably be more annoyed about "wagging the dog" if that was the case.