Not sure anyone 'competes' with 68k (aka The Amiga), people use what they use, not much market to compete in beyond that i suspect. As you say, you can make a nice living restoring classic cars, but it's a similarly small market that is limited by demand.
Well, apparently, Hyperion sees the 68K as competitor to their PPC machines, i.e. block development on 68K to drive PPC. I believe this is not a very wise decision. You cannot behave as if you are the new Microsoft and at the same time see 68K as competitor. If you want the former, you should create more powerful machines, more powerful than PPC can deliver.
Instead, Hyperion is stuck between two fronts, the PC machines that are lightyears ahead of everything they do, and the 68K "oldtimer" users that have a PC anyhow and don't need a "slow incompatible" PPC. Doing so is not only ignoring the market, it is also just ignoring a good part of the potential customer basis for products that could be developed jointly on both platforms; then finally, let the user basis decide which system they want to invest to, and take the money from both groups. That would IMHO be a much smarter decision because you have much more room to "navigate" your company in.