It'd be better to use Big Hero 6 because it is highly underrated. This point in time? That'd be like saying "No Disney, don't build a cool new ride based on one of your classic animated films because it came out 100 years ago".
It doesn't need a full land like Cars Land (which was excessive for a franchise that only had 2 out of 3 good movies). But one really well done ride themed to
Big Hero 6, which IS a Marvel property is a missed opportunity. Baymax has been hugely popular as a photo-op character. So yes, the movie does deserve a ride more than the current live-action marvel films.
Just because a franchise has made a lot of money, doesn't make it good or perfect. And Disney needs to chill with the films (same goes for Star Wars), the quality is hit or miss. The fact that the land is being done in phases is repulsive. All that translates as- "Hey lets jack up the ticket price TWICE, even though we just raised it even more due to Star Wars Land".
Disney has lost their way...