I'm talking ideal world here, not reality - given the current climate of the RISC OS world, I can think of no better OS maintainer than Castle/Tematic. They seem to go out of their way to help developers (look at the documentation available on their website) whereas RISC OS Ltd seem to simply close everything off (lack of publically availble APIs, nonsense regarding locking out the 32bit SharedCLibrary from Select.)
In reality, the only future I see with RISC OS Ltd is peddling their wares for emulation. As much as I dislike the principle of this, there is a real hole in the market with respect to laptops that it nicely fills. Given time, this need will hopefully vanish and a native laptop will be available - an excellent opportunity for a second hardware company that wouldn't be competing with Castle but simply complementing their offerings.