Yes, if the WWE wanted Reigns to get over at the RR, they should have kept Bryan's return until after the PPV. For that matter, maybe they should have also kept Ziggler, Mizdow, Ambrose, and the other half of the roster that's more over than Reigns off of the show?
You mention that Reigns worked hard to get where he is, and that the Philly crowd ruined his moment for him. DID Reigns work hard to get where he is? Reigns didn't get over because he has a connection with the crowd, or because he worked his ass off to put on the best matches or give the best promos. He didn't get over with the fans organically through his own talents or dedication. He was put in his position because the boss likes him, and decided to overlook his many shortcomings (whereas guys like Cesaro or Ziggler don't get that luxury). He was picked out by Vince very early in his career to be protected and groomed into a main eventer. Everyone he's worked with has had specific orders to make him look strong. The WWE marketing machine has done it's best to tell us that he's the superstar of the year and one of the top superstars in the company, despite the fact that his main events and singles titles (or lack thereof) say otherwise. And he's been placed in an incredibly predictable storyline specifically designed to make him the new top guy. He even had the Rock come out to try and put him over.
I'm not going to say that Reigns was handed everything, but you sure as hell can't say that other guys on that roster haven't had to work harder than him to get where they are. For example: Daniel Bryan, who busted his ass wrestling all over the world, dedicated himself completely to being the best he can be in his craft, is consistently entertaining, and has overcome adversity from management at every turn to get where he is. Or Ziggler. Or Ambrose. In 2015, real life talent, ingenuity, and dedication goes a lot further with wrestling fans than fake storylines or a slammy award, and fans can't stand to see someone get handed the keys to the kingdom while so many others bust their ass in vain. Vince Mcmahon should have known that. He's the one who screwed Reigns, because he insists that the fans learn to love what he is selling, rather than figuring out how to sell the fans something they will love.