I still think if the ride story is set around 2085 or so on, the ride would have lasted longer at all three Universal parks (Orlando, Los Angeles, and Osaka). Since BTTF is Universal's own IP, they didn't have to share money with anyone and the franchise is still as popular as it was 30 years ago. The Simpsons and its land itself isn't that bad, but compare that to BTTF, it feels timeless, if only the ride is set around ten times further than 2015, it wouldn't feel awkward considering that year already passed by.