I've dropped Fedora and switched to Debian stable in anticipation of avoiding Wayland/Mir for as many years as possible. I'm not worried about fragmentation, I'm just tired of being an early adopter.
I'm not worried about fragmentation though.
My position is that currently X "Just Works" for me and I am not willing to sacrifice this stability so that I can test out the pet projects of a bunch of Red Hat and Canonical employees. I figure I have at least 3 years, hopefully 5, before I will be forced to switch. (3 years left on wheezy, and hopefully 2 more years with jessie assuming X is still the default and viable). 3-5 years to let them work out all of the kinks? Yes please, I'll take that.
The dust sure as hell better be settled by 2018.
I believe that a previous poster commented about 300, or so, different distros based upon 4 base systems.
We already have multiple mutations of the various operating systems, and now we've got another display manager to debug?