> "Just don't support the majority of consumer displays" isn't really an acceptable solution for an organization attempting to be a player in the home entertainment industry.

I would recommend Valve to create an official list of consumer displays that ("certified by Valve") do have proper support for the most recent version of Display Port with support for all features relevant to gaming.

This way gamers know which display to buy next, and display vendors get free advertising for their efforts that is circulated to an audience that is very willing to buy a display in the near future.