Let's face the fact that nobody is going to make much money out of a classic FPGA accelerator board or any classic hardware for that matter. Even Jens has said he's struggled to make much return on investment from his recent products.
Someone is only going to make such a board for love, lots of funky love. That said, it might be possible to at least break even and (maybe) even make a (small) profit if it was done right.
My suggestion would be to go for a semi-open-source approach to the FPGA core design. You'd offer up the code and people could hack away and use that code to create BETA cores but control what code is good enough to make RELEASE cores. There are lots of very clever people who are still in the classic Amiga community who also have FPGA skills they would contribute to such a project if it was managed properly.
