Re: Spiderman in the Avengers "world"?
Yeah I think it's pretty fair to say that people will always want it.
I think it's also very fair to say it probably shouldn't happen because it will take screen time from both franchises. And both franchises are already working on really cool stuff. Both sequels (Age of Ultron and ASM2) look jam-packed as it is.
I'm in the cameo/easter egg camp. If they showed us just a tiny something in either film, I'd be ecstatic.