If he puts up WR2 / borderline WR1 numbers this upcoming year, that makes him pretty special in my league.
I just checked a standard PPR league I was in and filtered the WR results on points scored for the season. Brown was WR25 last year. Sanders and Big Ben will be healthy, but owners expect A Brown's targets to increase. Why is this? There are only so many targets to go around. A good example from last year was Dez, Miles Austin and Witten. They were all drafted by fantasy owners to be #1 guys (top 12). Laurent Robinson scored more points than all of them at WR20. When a team has a solid #1 receiver like Mike Wallace, it is very rare to have another WR1 on the same team. There is just not enough to go around. A Brown is fair value at WR3, but A Brown owners can't see it.
I think the optimism stems from the fact that he accomplished what he did as a second year player and folks see further upside if he continues to improve.
Throw in the fact that defining Wallace as a "solid" #1 WR is debatable even with a healthy Big Ben. It's very reasonable to see this as a 1A and 1B situation considering the way each are used, and I'm not sure who the A and B would be necessarily.
And as mentioned, Miller nor the RB's represent a viable threat to either Brown or Wallace's targets unless Haley changes things dramatically.
SO, it's not unreasonable to project a bump in AB's targets and counting totals based on those assessments, if that's how someone sees it.
Sanders is a damn fine player, I agree, but if he is healthy it will be interesting to see who takes on the slot role versus the outside role or if he and AB are used interchangeably. If AB moves to a full time slot role I actually think his reception totals could go up while yardage and TD rate stays close to the same. Then again, even Tomlin questions whether Sanders can stay healthy.
But, again, this is all predicated on Wallace not receiving a tender the Steelers can match which IIRC you are banking on anyways, so the whole discussion may be moot, right? Or am I WAY OFF BASE here also?