Whilst I agree with you Chris on all your points stated, where you mention steel internals being technically inferior. You may have posted previously why they are inferior in the past, but can you elaborate quickly why you state they are inferior. Is it down to the lag I hear people talking about?. Having just had my turbos done with all new steel internals, I can't say I've noticed any difference lag wise. I thought the plus side of having steel internals was that they were stronger, with less chance of catastrophic failure at higher boost. The other reason reconditioning turbos was more appealing to me than buying new, was the price. New ceramics tubbies for Jspecs come in at around 2k for the pair, then you have fitting on top. Reconditioning with steel internals, seals etc etc costs half that. (obviously if your housings are cracked then recnditioning is out of the question).
As for Toyota being an arse and stopping parts supply, do you think an online petition will help.? I'm sure we could get a fair amount of signatures from the various clubs.