I'm really surprised to hear Cave is doing bad. I thought all their recent arcade games were huge successes in Japan, and that it was a good move to make some iOS games. Then again, there was a recent article on iOS not being the goldmine everyone thought it would be, at least on the apps side. As cool as Dodonpachi is, most iPhone owners probably don't know about it or don't want to play it. You never know, they could be closing down for totally unrelated reasons... Maybe they all got quite rich and felt they could retire now, lol. I heard a while back that the entire dev team took a year long vacation.
Either way, if they want to make more shmups, they can just be like Grev. Rent out a cheap apartment and work from there, lol. Shmup developing always was for the real men.