Marvel fans needn't ever worry about running out of films to watch featuring their favorite characters.  Kevin Feige is said to have a list of films that span into the 2028.

And, with an endless supply of characters in the Marvel Universe, and ability to make spinoff after spinoff, this doesn't seem like  stretch. 

Feige said, "It's like looking through the Hubble telescope. You go, ‘What's happening back there? I can sort of see it". While looking at his film map on his wall in his office, he said, "They printed out a new one recently that went to 2028."