If anything, the biggest problem with Sam is his age. Generally, child actors sucks. And an important thing of him is his age. So a Rich movie is more probably.
That being said, it would be very nice to have a young superhero (even younger than Holland's Spiderman). I can't believe that comic book companies refuse to make good use of their young ones. I always think of Billy Batson, Captain Marvel. Kids don't know him, but he could be everyones favorite. I mean, a kid that says a magic word and becomes a discount-Superman? Everyone's dream.
If Marvel could make a good adaptation of Sam to the big screen, kids would be buying Nova's Helmet, pretending they are also superheroes. Plus, he's one hell of a hero. He punched Hulk into space.