I agree it's not likely he suddenly catches 70 balls, but I don't think the above statement is necessarily accurate. Ajayi didn't catch passes like they do last year, I wouldn't necessarily say yet that he "doesn't".
Ajayi caught 50 passes in his final year at Boise. That is an insane number of receptions for a RB in college. Far more than Bell or Johnson ever caught in a season in college. More than Faulk ever caught, or Ray rice, or Reggie Bush, Theo Riddick, Christian McCaffrey, Ladainian Tomlinson, and on and on.
The only person I could find that even comes close is Steven Jackson, who caught 44 in a season.
He has the hands, they just need to decide to use him that way.