There is no one who will be running GNOME 3 (currently scheduled for Spring 2010 at the earliest) who will not have GL hardware. There simply isn't any chip out there that doesn't do GL at some level. Even my three year old smartphone has a 3D accelerator. If the Linux driver situation with regard to the only three chip families (Intel, NVidia and ATI) lacks 3D support, that should be considered a bug. Hardware GL is now as mandatory as 2D acceleration of scrolling a browser web page--you can scroll a web page without 2D acceleration (say on the VESA driver) but it's slow and painful.