An TAF remake would indeed sell, and sell a lot. Everyone wants one, and as others have mentioned, it's really rare to find an TAF pin that wasn't on location and worn out. As for the licensing issue with Christopher Lloyd, that was for a digital pin, and to be honest, they probably offered him peanuts.
For big remakes like this, you send someone like Roger Sharpe to pitch to Christopher Lloyd and cut them both a big fat check.
You can't change the artwork. Fester is in the flipper zone, and to anyone that's played the game for the past 25 years, it's like watching the special editions of Star Wars: Cringe-inducing. I also heard the guy who played pugsley wouldn't sign off, meh, who cares about him.