That's interesting, if a bit depressing. I'd buy Dangun Feveron if they released it on XBLA, but frankly, since it's in MAME, I'm not going to lose any sleep over it should they release it for the iOS. Now if they did this with Ibara or Mushihime-sama, I'd be a bit disappointed.
Anyway, didn't CAVE once say that they were going to start working on a new vertical shmup for the arcades last February? I wonder what happened to that? It could very well be the thing which determines whether they'll stay or leave the arcades. But like Strider77, I'm probably not going to be too fazed as long as CAVE keeps pumping out shmups for home consoles.