No.In reality yes. I think this discussion is about how TWDC wants to present their female characters going forward.
I think Disney wants to move away from the princess who need a prince to save her, and move toward a self sufficient, strong heroine who does not need a man, and is a leader.
The princesses can wear different things at different times. There is no rule that Disney imposes on itself that they have to pick one outfit for each princess and no matter what the situation, present that princess in that get-up.
Belle still meets in her peasant outfit and her ball gown and always will.
I see no movement on Disney's part to limit the princesses to one outfit. This is all in your mind.