I think it really boils down to what you call a boycott. I'm sure some people won't go see a Disney movie for political reasons. But I think that's an insane minority. What I do think you now have is that Disney has lost the benefit of the doubt. I think before people would go to movies because they saw Disney on the name, and I think that trust is gone. That name no longer means "pack the family, we are heading to the movie. Don't know anything about the movie, but we are off." I do think one thing we are learning is Inside Out was a much bigger property than it's been given credit for.
Other thing is, going to the movies is no quick easy family thing anymore. We were going to go this weekend, but tickets for the 4 of us were almost $50, and then another $50 for food/drinks. It's just not a "Hey, we have nothing to do, lets head to the movies today" thing for a lot of families, it's a plan and budget thing.