That does sound like fun, I'd play around with it in smaller brackets and in BGs/World pvp for sure.
I severely doubt it would make up for the lost burst damage in 5v5, however
This seems like as good a place as any to plug a movie I threw together, my team has more or less stopped playing 5v5 except for selling points. The video quality isn't brilliant and the editing is virtually non-existant, however if you're interested in high end 5v5 gameplay give it a look.
Xargify 1 - Elemental 5v5 By Xarg