I really have to wonder where the Marvel Cinematic Universe is going to go after Avenger's 4. I mean, pretty much since they made it into a "Cinematic Universe" (as opposed to just one really cool Robert Downey Junior vehicle) they have been leading up to this whole confrontation with Thanos thing. And in a few months, that will be complete for good or ill.
Which means one of two things has to happen. Either they are going to have to find a new over-arching story. Or they will cease to have any metaplot at all and the MCU will then just consist of a bunch of different movies that may intersect a little bit but lack anything to bind them together. Either choice is fraught with the possiblity of things going very, very bad.
My hope is that they pick a new metaplot. Goodness knows that the comics are filled with ones to choose from. I think the Atlantis Attacks storyline might be kind of fun, and would give them a chance to bring in Namor, a character they have been talking about making a movie of since forever. If you are unfamiliar with him, he is essentially Marvel's version of Aquaman, only not as goofy. And he looks sorta like Spock. Of course, Atlantis Attacks is just my preference and I figure it isn't likely to happen. But a man can dream. The downside of them picking a new metaplot is that whatever one they choose, it just might not grab people in the same way that The Infinity Guantlet did. The public is a fickle beast and it is hard to say what will strike its fancy and what will not.
Then there is the possibility that they just go the "loosely connected movies route". This is probably the safer way to go, but it has its risks too. In my view, the problem here is that the whole deal with the infinity Stones woven through the different movies made people care about the story as a whole. And thus made people willing to take a chance on movies featuring heroes they were not familiar with or did not care for. And if you wonder why that's a bad thing, I give you Guardians of the Galaxy. A group of heroes that really only die hard comic book nerds cared about prior to the film. And yet, I think I would get little argument if I said it was the best Marvel movie of the lot, at least until Black Panther came along to dethrone it. And speaking of Black Panther...same thing. Not one of Marvel's most well known titles, but people's interest in the overall plot led them to give it a chance and here we are. So it would be a shame if some future movie in the franchise with the same potential as those two went unnoticed because there was no hook to draw people into a movie about a movie or character they were unfamiliar with or didn't care for.
I also wonder what will happen with some of the existing characters once this era of the MCU is over with. Ironman for instance. He kicked off the MCU with a bang and I doubt an Ironman 4 is in the works. This is a shame not only because the character is such a great character, but because Robert Downey Junior is such a great actor. So is the character just going to pack the suit into storage and we never see him again? I hope not. Thor and Captain America too. While I don't like either of them anywhere near as much as Ironman, I still would hate to see them relegated to bit players in the future of the Marvel Universe.
So, the MCU will soon be in flux and it has the potential to go very good...or very, very bad. It will be interesting to see which path it takes.