At the very most, a few months, like Bryan's reign. With the likes of Sheamus, Del Rio, Orton on Smackdown, he'll likely only hold it a month or two. Guys like Ziggler and Bryan will never be the top stars, they'll only be the filler main-eventers. Guys like Sheamus, Cena, Punk, Orton, Del Rio, are the talent that WWE truly value, and they're the ones who get the long, established reigns with the belt.
Originally Posted by DoubleDeckerBar
If they build him up to be a credible Champion there's no reason he can't hold it for 6+ months in my opinion, it's only the Smackdown belt after all.
So no then.