One of the nice things about X clients is that they work on remote displays with none of limitations you get with things like VNC (e.g. no cut and paste does not work between local and remote applications). If wayland breeds clients that can't do this then it is a giant leap backwards.
I *don't care* about flicker free movement of windows, video, or hardware accelerated graphics because I rarely do anything which would benefit. Sacrificing network transparency, which I *do* need, to get those is completely stupid.
That said I am writing software for very expensive server hardware.