Guild Wars 2

You could even make 5v5, 4v4, 3v3 variants, etc.

Adding Team Arenas for 2v2, 3v3, 4v4, etc. variants as well

This would solve a number of things:

-Variety in sPvP modes
-Grouping with friends
-Bridging the predecessor with its supposed successor (Guild Wars TWO)

I would love to see that, more options is ALWAYS a good thing.

Of course, people will come here and freak out assuming for some reason Anet will balance around it.