Grizzlor said:Aside from Hardy, all of those guys lack deep voices, the kind like Harrison's. I think that's a big reason he was so perfect for the role. I easily took Pratt seriously in JW, I think he put his comedy chops away well. That being said, his role there was an odd one, because aside from the action aspect, the script was written really with Bryce Dallas Howard (who I adore) as the true lead character.
Hardy could probably pull it off just from pure acting skill.
My worry with Pratt is that I wouldn't be able to take him seriously as an academic, and that his style of comedy is too goofy.
I'll throw out another name I've thought about recently: Oscar Isaac. He seems to be playing a Han Solo-esque character in Episode VII, and he can definitely pull off the academic and wry ******* side of Indy (see: Ex Machina).