The Amiga market hasn't been a big money-maker for a long, long time. I seriously doubt the Friedens ever expected to make a lot of money off OS4. Nobody would take the risk developing software for such a weak market for monetary reasons alone. There are a lot greener pastures for good programmers than the amiga.
If A-inc really cared about the amiga, they would have made sure there was hardware to run OS4 on. They have left Hyperion in an unrecoverable position in which they can't sell their work because there is no hardware, and they can't rewrite it for any other platform that does have hardware.
Personally, I think the saviours of the amiga market will turn out to be Dennis' minimig project and the AROS team. Since they are doing it for free and releasing all of the code, they can't be sued or caught up in legal battles.