He needs to change that finisher. ASAP.
And it's not that Vickie hasn't done a lot for him... but that union has outlived its time. It's just not doing anything for him NOW. They've been put together longer than Vickie and Edge were, and it's gradually played itself out.
He'll be OK tho', he just needs to start carrying himself more like a future main-eventer and less like a lifetime IC/US belt dude. And that doesn't mean becoming "serious", because that experiment already failed when they tried to change his hair and stop him from doing all the Ziggler shyt... but just by stepping his promo game up and not coming off like an NXT guy. He probably does need to cut more promos live, and I'm not sure if he practices in his spare time, but he's not consistent enough with them yet. He'll have a good one (like the one with Foley, and the one he had in Mexico), then have one that completely misses its mark... so it's not like he's incapable, just needs to be able to do it every time.
The biggest problem I see is that much like Morrison was, Ziggler seems better and way more natural in taped segments (like the Ryder show) than he does in front of a live crowd. If he could fix that and either drop Vickie or replace her with someone else (like Flair if that rumor is true), he'll be good to go.