7. Shia LaBeouf
The Case For: LaBeouf has been in some blockbuster movies. The Transformers franchise, Oliver Stones Wall Street sequel, and Kingdom Of The Crystal Skull. More recently he has been getting into some more solid material, playing a prohibition-era moonshiner in Lawless and an ambitious young journalist in The Company You Keep. There was also his notable appearance in the video clip for Sigur Rós 'Fjögur píanó', sans clothes.
The Case Against: LaBeouf hasnt yet shown he can carry a film on his own back, at various times hiding behind giant shape-changing robots and Indiana Jones. His characters tend to have an air of insecurity about them, which will not cut the Gosling mustard. Also, in the interests of full disclosure, I still think of him as the clueless, slightly annoying, borderline pudgy kid in Constantine and I Robot.