Uhh... I think you seriously underestimate the popularity of Baymax and the movie itself. People are still talking about it all over the place and it's been on 3 outdoor movie screenings within a 40 mile radius of my town since covid started. I'd say it's on Up or Finding Nemo level popularity.
It's not Frozen popular, but I'd say the film is pretty darn up there. On top of that, it had that TV show from 2017-2021. There's also that planned "Baymax!" series coming in 2022 I believe? It's absolutely a possibility.
And since popularity is what we consider a contender.... Then why do we have Tron coming to Tomorrowland? See, that's another thing. It doesn't matter what the IP is based on, as long as it's going to be a "thrill ride." (*Cough* Splash Mountain *Cough* Twilight Zone *Cough* Aerosmith *Cough* AVATARLAND!!! *Cough*) Woo! There's a draft in here.