He'd be the cool choice. Gordon-Levitt's been rocking ace indies for ages now, and he's dipped his toe in big budget territory with Christopher Nolan's
The Dark Knight Rises
). He's ready to take the lead in a tentpole now.
Erm, this'd be his first foray into proper heroics, but he exuded confidence and cool as dream-invader Arthur in
, where he had some scuffles in far-from-perfect gravitational conditions.
He was also ace as a high-school gumshoe in
There would have to be an extremely tantalising script to attract him, as he favours interesting projects over generic fluff (and, yes, we are choosing to ignore