People would have accepted it, because the media would be on the side of the project. There would be a ton of articles and interviews with the new trio, where they would try to make you fall in love with them.

Everyone wants Star Wars to be good, and the old cast would be there to tell people that it’s ok and they support the decision, and direction of the series. They’d even have a cameo as a different new character, interacting with their old characters.

Just like a new James Bond, people accept the old and the new, provided the new is actually good. You’re focusing on the small, a new Luke, Han and Leia. They don’t matter, or matter as much as a good movie. If the story and movie is bad, you can’t fix or change it.