True, the RR arenas had the majority of players, but that was because that was where pretty much all of the baby seals went during their two week trials. The FR arenas were decently populated and most of the people in it were usually pretty serious about the game. Good times they were
It's been quite a while, but as I remember, the Korea arena was difficult because it was FR and with the high closing speeds and almost instantaneous high-G blackouts it was very hard to keep track of your opponents. Also, there wasn't really all that much to do in the Korea arena other than A2A.
Things are different now though. The graphics today are much better and have more detailed terrain features. There are alot of people flying with TrackIR and/or multiple monitors, giving them better situational awareness. People are flying wih with force feedback which can help deal with the high-g blackouts. The ground war component in AH is much more involved and has more participants than AW had and AH now has a high alt bomber that can be escorted by the jets.
With all of this, I think that a Korea arena might work better than it did in the past.
I have had the opportunity to hang out with members of the 13th Bomb Squadron Association. A great majority of them crewed B26 (A26) Invaders in Korea and their stories of missions down on the deck, flying through the mountains and valleys, dueling it out with flack sites, attacking targets like tanks, bridges, trains, convoys, etc... are incredible. It was a whole different air war down there and I think that AH could gould di it the justice that AW couldn't.