I agree with most of these. Arena mode started off as an afterthought or to test combat, but it could easily be almost as big of a draw as the main campaign.
I certainly hope not. The more focus which is devoted to that multiplayer mode, the fewer resources go to the single-player campaign. That's just the reality of budget limitations and priorities.
Yes, you can play arena in single-player, but by it's very nature, it isn't deep enough to be a long-lasting interest holder.
