BaldEagl does bring up a valid and often repeated complaint: not being able to log into the arena your squadies are on and fly with them. Expecting all your squad mates to change arenas or countries to accommodate you just getting there is not a reasonable option. Not facilitating the squads and team cooperative efforts takes away a large part of the game for many players.
The other night, Knits took Blue, and the arena cap for Orange dropped from 320 to 120 in 5 minutes, with 290+ players still in Orange. Very few players logged back into Blue after that it seemed.... well more than half the pilots just logged for the night rather than jump into the reset map. Anyone who got disco'd from Orange was not getting back into it either.
I do switch countries these days; since the arena split, the strategic side of the war means little so I don't fly heavy buffs anywhere near as much as I used to. I don't like being with the country with a horde going, because as BaldEagl stated, when you *do* find a fight, it's often 4 or 5 on 1. Not fun for me, so I go often to the country with the least numbers (and often find myself the 1 vs the 4 or 5... oh well, score don't mean much anymore anyways).
For the first year and a half, I flew exclusively Rooks, but as Rooks have the greatest numbers more often than not when I log in, I don't find myself flying with Rooks all that much any more.
I also bounce between Blue and Orange. The EW and MW arenas don't have enough population to interest me as I spend too much time trying to find a fight in the first place at times.
Burn out on the game is a reality: I took a three month break for a while, and I may be taking another one here again shortly at this rate.
But additional content is also important to keep the players that have been around for a while. How important that is to the current business model is of course a question? If enough new players are joining to replace the old players leaving easily enough, then you have to ask if investing in new content and development is worth it or not. There is also profit margin to consider. And, the game HAS been around for a while, so you have to take into account the expected shelf life of the game. This will play into any plane additions, maps (are there any players still making maps btw? I looked at it, but seemed pretty daunting task to me), and arena changes that happen or don't happen.
I'm not altogether clear on exactly why we had the arena split, or the arena cap's purpose, what the intended goals or objectives were, but I gather from most of what I read here that the experiment failed for the most part, as far as the players see it.