Eh, I don't really think he'll do it. Sure, he's got talent and speed, but it's been a battle to win both races. If the Derby had been another furlong, both Dullahan and Went the Day Well would have overtaken him and he would have finished 3rd at best. Both of those horses are on the roster for the Belmont and Dullahan didn't run in the Preakness, so he'll be fresh.
I also agree with Themacpack up to a point. You just don't see the same quality of TB as you did 30 and 40 years ago. Sure, they're faster, but they just aren't as sturdy and don't have the staying power to race hard and frequently and still win.