MU has the same relationship plot as Monsters Inc. Mike and Sully struggle because of their differences, they clash, they break up, but in the end, their friendship is restored. There's nothing inherently wrong with retreading the same ground, but Monsters U lacks a lot of what makes Monsters Inc so unique. One great argument I saw on YouTube once pointed out how if you took the monsters out of MU and replaced them with humans... very little of the plot, or the world design would change. In Monsters Inc, the world is unique, it's designed to accommodate thousands of different monster types. But Monsters U is just a human campus... with monsters on it. And that reflects the whole film as well. It's not a Monster movie with a school theme. It's a school film with monsters haphazardly stuffed in.
You're right about Bo Peep, that's no prob whatsoever.
Just cause a trailer is well made doesn't make the film good. I'm less frustrated with the design of the trailer (which was, as you said, well made, even if it did potentially give too much away. I love the Beach Boys too, so props for that) I'm more frustrated with the plot.
Sure, you pointed out specifics that are different, but at their core... it's the same film structure. That film was about not wanted by Andy, yes, but it was also about Woody wanting a different life where he was loved by more than just one boy. It was about his greed. He wasn't going to do it for Jessie, he was going to do it for himself. She was simply a strong factor in it all. That's the same (at least in the trailer) of this film. Woody doesn't think about staying because Bo Peep wants him to, he considers staying because he wonders what life would be like as a toy loved by many, many people. The core structure of "Woody gets lost, the toys save him" was instrumental to Toy Story 2, and that's exactly what the other toys appear to do in this film as well. Forky may very well add a new wrinkle, but he doesn't even appear to be the focus in this trailer, like the two teasers before showed.
And lastly, Toy Story 2 is deep. I can't say anything for this films, since it's not out yet, but Toy Story 2 is probably Woody's most introspective moment. We have him struggling with celebrity and fame, versus the love of one person. We see the loneliness and fear of abandonment that Jessie struggles with, and how her and the Prospector manifest it in different ways. We see Buzz forced to confront who he used to be (quite literally) and come to terms with how he is now, versus how he used to be. Powerful stuff. People always brush aside Toy Story 2, but it truly is a film that had something to say, it had a message, it had a story to tell. What does this trailer have? We already had our conclusion... the toys had their arcs. Why is Woody being forced to repeat the same character arc for a third time now?
