The one thing I don't like about an Encanto tree house is that Disney loves to go cheap and just re-theme an older attraction instead of giving popular new franchises their own attraction built from the ground up. I totally agree a Mystic Manor style trackless ride that goes through all the family members' rooms would be really fun.
They could even use a scoop ride (if they are allowed, not sure if any patents or agreements block this) or even an advanced omnimover with a motion base. I understand why a trackless would be fun but I question the system's reliance and cost to implement.