Could definitely see them keeping six. Say what you want about Pettis, but there's a lot of reasons why he's stuck around every year, and he can play special teams. I think he and Givens stay at least for now. On the other hand, if Britt doesn't shine in the first four games of the season, gets injured, or if he screws up off-the-field within that timeframe, he's gone when Bailey comes back, in my honest opinion. I know that it's not a popular opinion, but Britt needs to earn my trust before I name him as a lock to make the team.
I also think that Moe makes the team as a sixth wideout. Out of all of the candidates, he's the guy who has what others don't. He has the best potential to be an Amendola/Welker/Edelman type, which is something that we currently lack. And his special teams ability gives him an edge over guys like Austin Franklin.