You make a good point. But hopefully there will be other guys to go to so less over reliance on welker. Maybe not more productive but more versatile. The whole offense will be more productive. I have no doubts. All IMO of course.
With the loss of Hernandez coupled with Gronk's injury i don't believe they will score as many points as they have the past few years but they should still have a really good offense, especially if the rookie WR's can have decent years. In short i am not that worried about their offense and still think they will be a final four team once again and getting past that point will depend upon how their defense progresses.
Basically the only thing I take issue with is the claim people make about Amendola putting up bigger numbers than Welker, which i just don't think is possible as it would require historic production from him and as good as i think he is i don't think he can put up the numbers Welker did.