Well Rhodes becomes War Machine, which is Iron Man with a bit more weaponry and in the silver armor you see him look at and say 'maybe next time'. It is a signifigantly bigger role, could become a spinoff, etc. He's had his own if not multiple comic series, was part of a few super groups for a bit, and worked for the government I think. If Cheadle nails it and signs a nice contract, he could be doing a few of these movies, some with him as the primary star and not second fiddle.
Also not sure residuals are available to that many people in a movie... like supporting actors. Can't believe how much Keanu got for the second two Matrix movies... something like $200m cause he got like 15% of the gross.