Re: Avengers Sequel ideas?
The only way to know if it works is if they give it a shot. But I'll tell you what, I'd rather have Marvel than some other idiotic studio (i.e. Galactus as a frickin' cloud) try and attempt it. (the whole omnipotence thing)
As far as Tech Goes:
We only have seen what we've seen on film. With secretive agencies like SHIELD, not to mention the fact that they are introducing (aliens, gods, and machines created by Gods). Even for a casual fan of the movies, I doubt it would be so unbelievable to show that SHIELD has some pretty advanced tech we haven't seen yet. A good time to show some of that stuff would probably be against an Asgardian God and an Alien Army.
The great thing about Marvel doing their movies is they can introduce stuff that hasn't been on the films yet but its not a stretch because it is in the source material(marvel comics as a whole) therefore really, anything is possible. Pym and Stark are two of the Smartest people in the Marvel U. Bring Banner into the equation, and I'm sure a super advanced AI such as Ultron could find a way to incorporate some advanced Stark and Gamma Tech and make it even more advanced to suit his Kill all Humanity mission.
* Plus, Ultron in and of itself is highly advanced, and he is always looking to improve. If they use Ultron in A2 the tech is inherently already available by him being there, In my opinion.