The fact that someone is stepping up with the resources and the time and the $$$ to make things like repro doors, cabs, and other parts happen should indicate to all of you that first, there's a market for this stuff. Second, there's a demand somewhere or people wouldn't be making this stuff. Third, the quality of the parts and affordability will dictate whether these repop parts will sell and be successful in the marketplace. Fourth, a new part would sure beat a 60-year-old part, in many circumstances. Again, quality, price and durability will dictate what happens with this stuff.
The free-market economy at work...you gotta love it!