User blog comment:Jacknapier10/Which characters cannot appear in the Marvel Cinematic Universe?/@comment-24940104-20140514090757/@comment-24901406-20140514153707

The Original Human Torch made a cameo in The First Avenger, so it certainly isn't impossible. It would be more of a matter of whether they could fit the movie into the timeline and if they actually wanted to make it.

The problem with Namor is, as Kevin Feige keeps saying, "It's complicated." Universal have a rather bizarre contract, which is also why he hasn't appeared in any video games since Ultimate Alliance nearly 8 years ago. They are obviously trying to get him back before any others because at least the other four franchises (admittedly only two are really coming out very often) are still in use, and as a result still making them money, even if it isn't as much as them producing the movies in-house.