That only 'makes up' for it the 4 games a year Amendola is healthy for, he's good but made of glass. And one of the Pats' rivals got better on top of it.
It doesn't matter, honestly. The Patriots won't skip a beat. They revamp their offense with every departure. Let's not forget a few years ago, Hernandez, Gronk, and Ridley were nobodies. Before that, Welker was a nobody and Randy Moss was an underachieving headcase. BenJarvus Green-Ellis was just a fun name to say. Before that, the Pats had Branch, Givens, and Patton at WR and Ben Watson and Christian Fauria at TE. And let's not forget Troy Brown playing offense, defense, AND special teams.
Point being, Belichick will evaluate his roster in camp and design a brand new offense to maximize every single offensive weapon he has, because the man is one of the smartest people in football history.