Someone Thor like certainly makes sense but I don't believe going with the guy who actually played Thor is the way to go.
I think the actor who plays Bjorn on Vikings would make a great Thor, but he was too young back in 2010. He'd be perfect now for He-man.
Could work but if I were in Hollywood and knew of the previous movie and how it bombed and helped kill the toyline for awhile, I'd probably give it a pass.
Go watch the toys that made us episode about masters of The universe and see the reactions when the movie was brought up.