Went today! It's a lot of fun! Busiest I've seen the area in a long time.
Honestly, with the rumors of BTTF taking over Supercharged, I would love for the back half of San Fran to simply become Little Amity. This quick layover proves just how much can be done to improve the feel and energy of the area. The music loop, the classic sign, a whole bunch of references and cute bits of theming around store windows and facades, and build a little semi-permanent Seafood snack shack, and I think you have a pretty solid mini-land that would get a ton of positive attention.
Imagine walking into the former Supercharged facade, now themed to the Hill Valley Clock Tower, then exiting into Little Amity. Even without a ride, I think that gives the park a lot of that classic energy again. With the mini-land seemingly planned for both properties up in the UK, and with both IP getting decent layovers for anniversaries at USF this year, I don't think it's out of the question.