I am very skeptical that NE will be able to run the ball like that every week. Welker's main impact, is moving the chains. They didn't need him to move the chains, because they were playing one of the worst run D's in the NFL.
Will Welker catch 122 balls for 1500 yards, very unlikely. But, will he get 100 for 1000 yards, I would bet probably so.
Gotta think, if Brady throws for 4500 yards, that leaves room for at least 4 1000 yard receivers. I still think Welker gets to that level. And, for him to get 1000 yards, he will need nearly 100 catches.
Having said that, I'm trying to trade him as we speak.