I'd love to see 5s active to the point that even if your team is gimp at the moment you can still cap out by getting retarded teams, 1v5s and no shows. I used to cap out 2s this way dual boxing (just tabbing) in cata with my t2 DK and an alt that just sat there - with instant queues you could actually cap pretty quickly.

Of course ultimately I'd like faster queues and lots of activity in 5s so I could actually play for real and have good competition. But for now just being able to queue and mess around and still cap would be great.