I think that's the main reason I keep coming up with plots for MCU rather than the cartoon. Just too many characters, no matter how much I adore that silly thing. Writing fight scenes with five of them and one absent is hard enough. It really depends on the kind of plot it is though. Something tightly written would have a lot less room than a looser narrative that can wander when it needs to. However, speaking from personal experience, that usually means you're in for a long haul. Or very long haul in some cases.

I've only met Carol in Earth's Mightiest Heroes, but from what I saw of her there, I adored her. I really liked both her and Jan. Movie-verse definitely needs to include them at some point.