Well, if it's good, I'll stay for however long the ride is. TV had to learn viewers would do that several times over. They knew in the '60s that longform storytelling worked when the finale for the Fugitive had higher ratings than the Beatles on Ed Sullivan. Glen Larson knew it when he was developing Battlestar Galactica as a miniseries in the '70s. Joe Straczynski proved it again in the '90s with Babylon 5. And it's been a staple of daytime and primetime melodramas like General Hospital or Dallas since the beginning. Likewise, those Saturday morning serials that George was emulating and amplifying with Star Wars, but that Hollywood didn't really pick up on as a thing until fairly recently. I honestly think Marvel has led the way with their universe-building in the MCU, and I don't see it as a bad thing.
There are enough films coming out each year that you definitely have an easy choice to not see the ones you don't want to see. If longform storytelling isn't your thing, skip it. I think it can be done well or badly. I feel Marvel is doing it well, and DC is doing it badly. I saw Man of Steel once and haven't been able to bring myself to watch it again all the way through on home-video. I haven't been able to bring myself to see Batman v. Superman yet, just because of how little the trailers have compelled me, with help from the in-depth reviews. On the other hand, Iron Man surprised me, and I ended up seeing it three times in the theater, and ultimately ended up seeing Avengers in the theater seven times. And even after repeated home-video viewings, I am nowhere near getting tired of those films. And it's not about fandom...
The first comic I bought was Rom: Spaceknight #1 in 1979. I was a fan of the X-Men and their related books all the way through the '80s and into the '90s, and Iron Man, as well. Meanwhile, over at DC, I have loved their Elseworlds offerings, Green Lantern, I adore Mike Grell's run on Green Arrow, and most of the stuff under the Vertigo imprint. Just as with the Star Trek vs. Star Wars argument, I consider myself "bi" in the matter. So I don't have an inherent distaste for DC characters coloring my desire to see their films or my opinions of them -- it is purely on the merits of the films themselves.
And in this matter, one of the biggest reasons I want to see Hasbro team up with Marvel on this is that Hasbro wanted to sell toys. To that end, they approached Marvel Comics. Marvel's approach to G.I. Joe and the Transformers was far deeper, characterful, and even epic (in the case of TF) than I think Hasbro expected or ever understood, to this day. And, I'll be honest, I would love, beyond my ability to express, to see Rom show up in Infinity War...
--Jonah