Seeing what the team has shown interest in, yes they want a tall WR. Pete has even expressed that before.
You really have to look at who you have at QB.
Hasselback was very good at throwing guys open, throwing to an open side of the WR and throwing some jump balls. Notice that BMW flourished with Hass throwing to him.
Jackson has to hit guys that are open, and usually to the right side. He rarely throws to the middle and doesn't seem to see the left of the field at all. I don't see him throwing jump balls a lot, you have to have separation for him to throw it to you.
Wilson sees the field pretty well. He finds the open guys, but as we've all seen, he likes to throw jump balls. Tate was good at high pointing the ball even though he wasn't that big. That was actually a strength of his that was commented on in his college scouting report. Baldwin can win some jump balls and Kearse has shown that ability. The fact that Wilson throws it up to a guy that's 5'10" speaks to the fact that he likes to give his guys a chance for the ball.
A tall WR would play into this, but like others have said, it's really going to be about that guy personally. There are teams that stress certain physical characteristics to the point of ignoring some other weaknesses. The Hawks won't put a tall guy out there at the expense of a guy like Baldwin, just because the 1st guy is taller.
Matthews is an unknown, but he's big. Norwood has size and has shown a knack for making contested catches in big situations in college. He's going to get some jump balls thrown to him for sure.
I honestly don't think we need to search out a big body, but I don't doubt that JS is still looking just to see what falls to him. We had issues in the red zone last year, and some of it has been attributed to lack of size in the end zone. I'm not sure it's true, as Rice got great separation and I didn't see him win a ton of jump balls (they weren't necessary to throw him) at 6'4".