Which is actually my major point about UME. I've seen the discussion at Haze's blog where you and he browbeat etabeta into a pulp for suggesting there is any redeeming value to any of the MESS drivers. So I don't understand why you wish to force more people to use drivers you personally feel are sub-standard. (They aren't all, by the way, but I want people to have that choice and not just be forced into a one-UME-fits-all world).
Furthermore, Haze says the merger is to get the MESS people to work on MAME. So you want the creators of drivers you personally would never touch to work on a project where users generally agree the drivers are good?