It has been discussed at length, many have thought of it. The problem is cost. Look at what it is taking to get the Mini-Mig off the ground as a not for profit hobby project.
The return on investment for any larger projects just wouldn't be there. Not to mention some of the needed components like 68060 CPU's for accelerators, and the special ram for Flicker Fixers is almost impossible to find these days in any sort of quantity.
People like Jen S are a good example of small run projects and just how much time and money is involved.
That said, if you do come up with a needed add on for a reasonable price I'll probably buy one, and so will others.
Jeff