Oh, I think it will be a commercial success. I don't think anyone believes otherwise. I think it will be an decent movie too. I'm sure the critics will say it's better than sex, and more historic than the moon landing--but in reality I suspect it will be about as good as most Marvel solid "B" opening films, like the First Avenger, or Ant Man. Just short of Iron Man and Guardians, but good movies.The issue with people like Brie though is she's deep enough in the cult to proselytize, and once you have enough of those types in an organization--shit tends to go down hill quickly. Most humans will not project their beliefs to people they aren't sure they are synched with ideologically (So they may stand up and scream out prayers in church, but they wouldn't push that shit on others unless there was an opening that made them feel comfortable). But the small number of people who will? They can have a huge effect on people, because they alter the heuristics of those around them.
This is why people think like those around them--our brains are still set up to live in small, tribal communities. So you generally project the values of those around you into your assumptions about the world. If you have people like Brie pissing in your ear 24/7, it can dramatically change those views. (Only10-20% of people with strong beliefs can lead 80% to change their opinions in a group.) Because our perception of what the group wants is not based on what the group actually wants, but by evidence we can gather--which is dominated by those willing to shove their beliefs down your throat. This is why I constantly harp on why its important people not try to IOOTI this shit and avoid talking about it--if you don't express how much it pisses you off, people will assume everyone thinks like these jerk offs.
But any-case, what I'm worried about is that after this and Black Panther, you're going to have more people swirling around pushing the cult's views--and the movies are going to start changing due to it. But it won't happen until after Endgame at least, so at least we'll finish up this epic run on a high note. Hopefully I'm wrong, but...well, look at star wars. If you're seeing members of the cult proudly proclaiming using their positions to affect the story for their ideology, you can almost count on dog shit being produced soon enough.
