The matches would be fun, but ultimately the whole thing would be kind of pointless. For me, a key element to make such a thing a success is if both guys are on a relatively similar level and that's not the case here. Over the course of the last 3 years or so, Styles has become a bigger deal than Ziggler ever has been, by far and away, and the reasons why are his successes in New Japan and in WWE. From an overall perspective, Styles has been doing the best work of his career during this time period when most others in his age group are on their way down rather than up.
Ziggler's a talented guy overall, but the days in which most fans would/could buy him as a main eventer have come and gone. If you could take the Dolph Ziggler circa 2010 through the first quarter of 2013 and put him against Styles today, then you'd have a much more interesting scenario, like a young lion stepping up to challenge an older one for supremacy kind of thing. That was the time period in which Ziggler was a young up and comer with a lot of promise, before he'd suffered several significant concussions that effectively put the kibosh on any chance of being a solidified main eventer.
So yeah, I think you'd need someone that's young, hungry & with a lot of promise or someone that's on a similar level as Styles for a best of seven series to have the most impact. Unfortunately, Ziggler is pretty much damaged goods at this point and seems more like someone that's just waiting for the final few years of time on the clock of his career to wind down.