I don’t think he’d be enough of a contrast to McCain to help much as VP - while he’s not as old as McCain, he actually looks even older, for one thing. But he will probably be excellent as an advisor, and then perhaps some position within McCain’s administration.
I agree - even if he accepted he wouldn’t help the ticket much if at all. I know good conservatives who thought FDT was a joke, unfortunately. Personally I sent him money and was gung ho but that was then and this is now.
McCain needs some vigor for his VP.