Acorn went down because they unfortunately were sitting on a very large pile of valuable ARM shares.
I suspect that vast majority of Acorn shareholders did very well out of the breakup deal and hence from those quarters I can recall relatively few complaints.
Undoubtedly if Acorn had carried on with Pheobe they would have solved the technical problems they had encountered. However at the then proposed price of around ukp2000 it makes even the Omega look like a bargain.
Acorn would have carried on making losses even with Pheobe and would have carried on having to deal with the 'Acorn community' constantly whingeing on about what Acorn were doing wrong.
Castle have taken an enourmous risk in "putting Acorn back together". They have their own customers for RISC OS outside the desktop market, and therefore have a vested interest in protecting their brand reputation.
Of course there is the danger that a one horse race could 'damage competition'. However bearing in mind the huge range of software, hardware prices, economies of scale, and raw power advantages of the PC and Mac world, don't you think that Castle would have competition aplenty if they were the only player in the RISC OS market?