Look at it this way. What is Robert Woods capable of? Last year he put up 699yds; 5TD's. Considering he's 23yrs old and in the thick of his prime, I'd say he can still do better.
Lets look at other #2 WR's on playoff teams:
Bengals' Marvin Jones: 816; 4TD's
Pitt's Wheaton: 749; 5 TD's
Texans' Cecil Shorts: 484; 2 TD's
Chiefs' Albert Wilson: 451; 2 TD's
Skins' Garcon: 777; 6TD's
Packers' D. Adams: 446; 3TD's
Panthers' T. Ginn Jr. as the #1 this season: 739; 10TD's; or Corey Brown as the #2: 447; 4TD
Cardinals Floyd: 849; 6TD's
Woods' numbers last season are right there with almost all of these #2's around the league (and Woods played on a bad team, not a playoff team with HOF's passing him the ball)...same thing applies to Atlanta, Dallas, etc.
Again, he's 23yrs old and his arrow can still point up.
For people that claim they want an upgrade over Woods: where is that "upgrade" coming from? Furthermore, in this run-first offense with a superstar #1 WR in Sammy Watkins, just how many chances do you think this new #2 is going to actually get?