The only reason Stern would remove coin doors would be to make more money. I could see them removing the coin door entirely and just wrapping the side art around to the front. Then we'd actually get to see some of the art in a line-up of pins.
Coin doors would turn into an option like A/C in your car or shaker motors. Remember how it worked when phone companies were transitioning to pulse dialing. You want pulse dialing? That'll be $2/mth extra.