As an avid GVer, I do not think I would like a separate arena.  I like the dynamics of both the air and ground battle going on.  Like all other GVer's, I do not care to have eggs dropped on me during a good GV battle, but that is part of the game.
I think it is to easy to egg GVs.  I am one of the worst dive bombers there is, and I can still get two out of three.  I know this is not real life, that horse has already been beaten, but in reality could a P47 get three kills on tanks with three bombs on a regular basis?  I did a simple internet search and could not find anything conclusive, but for the history buffs out there I was just wondering.
I would like to see the GV icons shortened.  I think 1.5k just makes it way to easy. 
My opinion
Fred