They chose not to put in Falcon before guests decided “it sucks”. I’m sure you’re right and I have no knowledge of the RotR ride experience, dialogue, or level of interactivity.
“Move from here to here” is easily stated in English and French. The frequent instructions on how to play the MFSR video game, on the other hand, not so much. And heaven forbid the 6 “players” not speak the same language. There’s dialogue on Tower of Terror and Phantom Manor, too, but you can enjoy both just fine without understanding the dialogue.
I will agree with you that the guest response to MFSR cemented the decision not to clone it.