would the typical miner be likely to replace their GPUs with this product. What sort of penetration do you think it could make in the global hash rate?
I don't mine. I don't plan on start mining until there are small low power FPGA/sASIC/ASIC solutions available that I can fire up and forget. No whining fans, no noticeable heat output.
I don't plan on ever mining for profit. I would run such a system to help support Bitcoin. While I can't quantify any numbers for you, I'm quite sure there are others who - like me - are interested in Bitcoin as a social and political experiment more than as an "investment".
With all that said, without ArtForz or ztex at least considering your numbers to be plausible (Mhash/s as well as price) I belong to the wait-and-see crowd. Impressed and interested, if true.