While I'm not sure of Ace Combat's popularity in Japan, I can think of one other series that is no longer PS3 exclusive where the extra 360's sold won't mean much for the game's bottom line sales.
What? You just said that a few posts ago.
Anyway, I'll just stab away like a blind fool... Devil May Cry? Virtua Fighter? Bladestorm? Aww, just spill the beans!