Absolutely, John Morrison has the potential to be huge if the WWE pushes him correctly.
He's got great talent, he has a very entertaining move-set and he's decent on the mic. That is what could hold him back, the mic. It's pretty apparent right now that WWE is trying to develop his speaking skills, they've had him cut promos every single week and he's on the dirt sheet all the time, so hopefully he'll improve enough to get a big singles push.
Two things that Morrison has going for him are his look and the fact that all of his signature moves have big time impact. He has the perfect look to be a big star in WWE. Most people know that Vince loves pushing the guys that are good looking and ripped, and John Morrison fits that bill. Plus, his big moves look really impactful when he executes them. All of his jumping and spinning kicks look like they just take the other guy's head off.
I think that we'll se Morrison start to get a big push pretty soon. They'll break him and the Miz up and start putting him into single's title contention.