Castle leaving the market would be disastrous unless somebody else was prepared to take on the Iyonix as well as RISC OS. Iyonix is still streets ahead of any other RISC OS machine, and even the A9 when it appears is not intended as a top of the range machine like Iyonix.
I think (hope) this dispute has been blown up. AAUI all that was said was that it is illegal for individuals to distribute Castles SCL, since it is commercial software. This is no different to any other commercial software. Castle have expressed a willingness to co-operate with A6 and ROL to bring it to the A9. Why is that a problem? Why is it any different to any other commercial software developer offering to develop an A9 version of their products?