There was a similar thread regarding this last week, if I'm not mistaken, asking who the "face" of WWE was. As of right now, it's not Daniel Bryan. Bryan's got a ton of momentum right now and fans are eating up everything the guy's doing. However, it's going to take more than a couple of months for anyone to be established as the "face" of WWE.
Bryan is wildly popular right now. He's not a flash in the pan or some kind of fad who'll fans will be bored with next month like we saw with Zack Ryder. For close to 2 years, Bryan's popularity has only increased and it's not because of the "Yes!" chants. As of right now, John Cena is still the "face" of WWE and has been in that spot for the better part of a decade. In order to be the "face" of a company, it takes any number of things. John Cena makes money for WWE, no question about that. So does Bryan, but Cena has been making a LOT of money for a LONG time. Cena is also somebody who has tirelessly devoted himself to WWE. If they want him to make public appearances, he does it. If they ask him to give some radio interviews, he asks when & where. If they want him to make an appearance on shows like Live with Kelly & Michael, he'll do it no matter what.
Being the "face" of the WWE is much more than being a good pro wrestler, it's about coming across as someone who that best embodies whatever sort of business the company is about. WWE isn't just a wrestling company, and save all the "sports entertainment" word games bullshit, WWE is a brand and most companies want a certain type of person to be the "face" of that brand. John Cena is about 6'1", he weighs 250 pounds, looks like he's carved out of stone, has the classic All American good looks, clean cut, no tattoos, no history with drugs, no criminal record, no past history of controversy and projects the image of a straight laced, wholesome, family friendly person.
Could Daniel Bryan be the "face" of WWE? It's not impossible, far stranger things have happened, but he has a lot going against him. Daniel Bryan is not the traditional image one imagines for the "face" of a major corporation. Bryan's about 5'9" weighs about 210pounds, is in great physical shape but doesn't have the ultra chiseled physique like something out of a comic book, has a long, thick mountain man type of beard, doesn't wear fancy clothes, doesn't drive flashy & expensive cars, has a diet that's mostly vegetarian, doesn't own a television or watch television all that often, doesn't rub elbows with celebrities every chance he gets, etc.
That doesn't mean that Bryan isn't a hard worker and doesn't do everything he possibly can to put over and promote WWE. John Cena is someone who is much more mainstream in terms of image than Daniel Bryan. Cena is so mainstream, in fact, that it's one of the reasons why some people rail against him. Daniel Bryan is far more counterculture than John Cena from head to do whether it's about his looks, personal beliefs, to materialism.
If I were to equate them to famous musicians in terms of general mainstream appeal as it pertains to image, John Cena is Elvis Presley while Daniel Bryan is Bob Dylan.