As a Select subscriber I'd have no problem if Castle were to subsume all of the Select / Adjust code and release as part of RO5 for the benefit of all future RO users. The more people have these facilities the better and more likely they are to be used. What I would object to is if Castle doing this effectively ended development of a 26 bit RO and soley concentrated on a 32 bit RO 5. I quite like getting OS updates for my machine and can't justify buying an Iyonix for that pleasure.
I am puzzled about their desire to licence RO 3.7 (with its inherent FS limits) or RO 5. I can't imagine Virtual RiscPC benefitting much from either. Perhaps that's the plan? And what about the A75? If Advantage Six had wanted an embedded RO 5 they'd presumable have gone to Castle rather than to ROL for an embedded RO 4?