One the 2nd page near the end they discuss the feasibility of adding network-transparency to Wayland; according to the author Wayland is both hugely asynchronous (so network lag isn't a blocking issue) as well as completely event-driven, so receiving those events from a local process or a remote connection are the same thing to it.

I don't think we'll all have what we want soon, it sounds like mid-2013 or end of 2013 before all the dust is settled and we know what our Wayland-future has in store for us.

Until then, there looks to be just too much low-level work to get done to try and guess where it will all fallout.