b) Would run MUCH cooler than the BPPC and BVPPC solution we have now and would need less power.
PWRficient PA6T produces more heat than the 603 CPUs used in BPPC. You also need to consider the support chipset power requirements.
e) I don't believe that. How? they would in effect be using parts they already have, or have access to.
Parts are only part of the problem. There are much larger problems with trying to convert a full blown mobo to an accelerator. Also, the company producing the card has no amiga experience at all, which would make it much harder and more expensive.
d?) I think this would sell more than the X1000, but thats just my opinion. so more 3 figure. it could be a more simple PCC only accelerator for even cheaper. It was only an idea.
As far as I can tell BPPC already was a borderline at being profitable at all. These days the potential market is only a fraction of the old one. No way would such an expensive and complex board be profitable now.
f) The current PPC cards (if you can find one) cost more than what I mentioned, and it would effectively be the "cheapest" OS 4 solution on the market.
I very much doubt your price quotes.