Last year might have been the deepest class of receivers in years yet three still managed to get drafted in the first 11 picks, with another two drafted in the top-28. I don't see receivers falling, and I'd be absolutely shocked to see Amari Cooper available at 12.
And what about their value? All those first rounders from last year were already returning value as first year starters, and every single one of the five is penciled in as their respective team's #1 receiver heading into this season. There was even second rounders (Jordan Mathews, Davante Adams, Jarvis Landry) that were productive for their draft slots.