That might be enough, that's what we had during the last SB run.
Do you think Boldin, Torrey, Jacoby Jones, Pitta and Ed Dickson are substantially better than Wallace, Perriman, Moore/Camp and Pitta/Williams/Gilmore? I don't. Besides,Oz adds at least 1 pass catcher before the season maybe more. Sure you can say "but injuries...". The fact is they are a part of the game, can't
Perriman gets a starting role this season, with a full TC, and will do tremendously well: 70-80 rec, 1000-1100 yards, 6-8 TD's.
He got rid of his rookie jitters last year and will make an impact this season imo.
The keys are: (adequate) protection by the OL, for Flacco to gain more confidence post injury, and for the running game to become a consistent, viable threat again.