What do you think 2015-A was like?
I always felt this would be interesting since it's "the future" AND dysotopian at the same time!
If you take it as canon that Lorraine shot and killed Biff in 1996, then it could've gradually gotten a little better 20 years later (though the changes he had already made on not just Hill Valley but the world's political history, would've been so far reaching it would be impossible to undo all of it). Or his son could've just continued his legacy where it might've stayed about the same or even got worse.
Hilldale and the skyway (all we briefly see of it in the movie) were both still built, so life would've been at least slightly functional. I wonder if the downtown Courthouse Square would still be a toxic waste mess with high crime? Even going on the bast case scenario, maybe they remodeled Biff's casino to be an upper class luxury style hotel?