Is hardware accelerated 3D necessary?

["foss[ilized]" <fosslistmail googlemail com>]

I took a look at the sceencasts. While I understand that gnome-shell
is a work-in-progress, my initial concern is that the zooming effects
would not work on a typical multi-user Linux system.

Hardware accelerated 3D on Linux appears to be a single-user affair at
the moment. Only one logged-in user at a time can use 3D acceleration
(see for example discussions like the one on the DRI-Users mailing
list: http://marc.info/?t=119413177000001&r=1&w=2).