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R_Hythlodeus, Mike5575
Iron Man, Thor and Captain America just appearing as "guest stars" - was also my first thought.
Iron Man is such a "guest star" already, and i am expacting him also in "Spiderman".
To turn to new faces may be a good thing, and there are lots of possibilties still - but i think, it makes no sence to build the future without solo-movies on Thor, Iron Man or Captain America. There are so many stories to tell, and the fan base is there too...
A - in my eyes - bad "Iron Man 3" made 1,2 billion... Captain America is on a roll...
With Thor, it is different - but because of production too (director, budget etc.) -, okay, but after "Thor: Ragnarok" i am sure, everybody can not wait for "Thor 4".
I think it is a must to keep up doing sequels for them. With RDJ it is just the money. Chris Evens said already, that he will be on board, if Marvel wants to...
With Chris Hemsworth - do not know... but we surely will miss Loki, or?
And - one thing we may not forget. Thanos will destroy Asgard, or someone else will destroy Asgard (with Loki, Odin and all the others) in "Thor: Ragnarok" - but Thor will be back for "IW 1+2".
If he gets not killed at the end of "IW 2", there has to be a movie about the
resurrection of Asgard.
The buttom line - i think it would be a waist not to do further sequals on Iron Man, Thor and Captain America. A BIG waist, and i do not think, that Marvel thinks this way...
They will pay RDJ or recast him after "IW 2", they will keep Evans for sure, and Thor will "bring back Asgard, as it was, before Thanos strikes"!