To me, there's more than one way to skin a cat.
If the Steelers were to get another very good wide receiver, they could start to punish teams who go all out in the pass rush and build Ben's confidence as far as getting rid of the ball on time.
The quickest way to beat a blitz is to go overtop of it. As it stands now, Ben doesn't have a guy running deep routes where he can just put the ball up and let the WR make a play.
Yes, Holmes is a deep threat, but not a guy who is going to consistently come down with jump balls. He's more of a play action deep threat who needs some time to build separation so he can run through the ball.
If Otah or Albert is on the board, I think it's a no brainer. If not, a big wideout would help reduce the number of sacks Ben takes, just in a different way.