I think it's certainly a possibility that the team could draft a WR prospect for the future, although we are all likely in agreement that it's not an immediate need for 2012.
As you said, that hasn't stopped them before from taking prospects to build for the future.
Hopefully, there will be a priority of sorts which primarily focuses on the defensive side of the ball more, at least with the earlier picks.
I do not think that many of the WR's that are listed besides Welker, Llyod, Edelman, and ONE of Branch/Johnson/Stallworth are "safe" from being upgraded if possible. Most posters will differ on their opinions as to who is safe and who is not safe, but I think it's reasonable to consider 4 WR positions safe right now, with Welker and Llyod being the 2 of 4.
Edelman, as always in many discussions, is a wildcard of sorts; depending upon where you'd personally put him as a position.
I'm fine with taking a WR, but I certainly hope to see defensive picks with at least 2 of the picks through the second round. Anything less will be very bad, in my opinion. There are weaknesses, needs, and positions that need upgrading and depth on that side of the ball more.
With 4 total picks through the 2nd rd, I am imagining the possibility of 2 defensive picks, 1 offensive pick, and 1 trade.