Really good idea OP, and I fully agree. The only thing that comes to my mind as to why this would be an issue is the game engine -- it's simply not robust enough to support that many players in the same zone at once.
But then again, I want to have fun so bad I really wouldn't even mind having old Ilum back, even at 10fps.
Heck, pushing pubs into their base, then climbing on top of their base to nuke them from above is just fun. Pick off a bunch of people before they figure out where all the death fields and force storms are coming from.