Amazing Spider-Man has. That is correct. But that is one of the very few films that have gone that route and was warmly welcomed, it wasn't seen critically as better than any other Spider-Man movie though except the third one. MARVEL hasn't gone that route with its MARVEL films - Spidey is SONY. When I say MARVEL, I mean MARVEL produced.
With each one of the movies released up until now they had the goal of a trilogy in mind, they actully stated this a few times. As for Amazing Spider-Man, well, i too prefered Sam Raimi's spidey 1 and 2, but it's very debatable, and many consider it better than Spider-Man 1
If a Green Lantern happens that would be easy to fix since everything is fluid. Let's say Thor's film is beyond words terrible. Will Thor be cut from Avengers 2? Nope. They'd just make sure to have a great Thor in it. Also Thor is accompanied by Captain America, Iron Man, The Hulk, among others. Thor would cause no dent in Avengers 2. Also the ONLY thing that's transferred is the characters. Say THOR films individually don't do well at box office - well, keep Thor to Avengers and no solo films (look at the Hulk, for example).
Yeah, and that's what i meant with foreshadowing elements for sequels could blow up in their faces, Hulk for exemple foreshadowed the Leader, and now there doesn't seem to be any interest in using him again.
The thing is - you didn't state that until later, that's you back-peddling light as day for everyone here. You said films with post-credit scenes fail in general.
I'm sorry if i didn't make myself clear enough, but aside from MCU's films you can see a big variety of films trying to spawn franchise in similar way that failed miserably.
Dude, only comic fans would like to see The Leader -- the mass audiences have absolutely no idea who he is. For all they know or care he could be locked away or died. That's the thing, these 'tags' are so fluid you can do ANYTHING you want with them. Literally ANYTHING you want. They're that fluid.
Up until now, it's very difficult to keep something of this proportion running for so long, as many franchises have shown before there are allways ups and downs, problem is that if MCu goes through a down phase all they worked on may crumble on their feet, i'm not sure either if in 10-25 years from now people will still be interested in seeing in least 2 connected superhero films per year.
MARVEL is being smart - they are "together, yet apart" - making sure that they all stand on their own two feet without anything you need to see to enjoy any of the films. This is why you're "but, but, but -- strands!" will never come to fruition because MARVEL has thus far made sure that these strands are remarkably small so that these solo franchises have no real major baring on one another except for when they all come together. Name ONE strong stand outside of the cosmic cube that's not the same characters. They are going after things specifically that have no major impact on one another for a reason.
When i talk about forgotten plot points i talk about things like the Leader, which wasn't that bad considering i, who at the time didn't read the comics or know who the leader was, thought the dude was dead and was smiling at his creation (the abomination). Now, in one Phase they left this plot point, this time it wasn't a big deal, but who knows how it will be next time? Or the one after?
The thing is that the MCU is a completelly different film franchise than what we've seen before, there's no clear example from the past for everything that may go wrong, i'm just pointing out some of my worries, as i said this is something we won't be able to know until some years from now.
Now about this thread itself, The Avengers does seem to have inspired other studios to do shared universes. Paramount is toying with the idea of a G.I.Joe/ Transformers crossover, Fox wants to do a similar thing with the properties they do control, plans to connect the Evil Dead reboot with Army of Darkness, as well as a crossover between the two are being put into motion, i remember some talk of a Magic Kingdom connected universe but i'm not sure there are real plans for that, DC is entering the game, it will get even more confusing if The Fast and Furious branches out into spin-offs, with that planed solo for The Rock's character.