Interesting, this is one of the first things I thought of when I saw that Papi was going to be laid up. I also do not think we should do it. He is such a pompous you know what. He's the Phil Jackson of the MLB in my opinion, just minus the rings.
Most people are saying it will only be a few weeks to a month before Big Papi is back. I think it is great to have Manny DHing, he can focus on his hitting and his shortcomings that he can have from time to time in the outfield will be gone (although this is really gonna hurt his Gold Glove campaign). I love the speed and versatility that a Drew, Coco, Ellsbury outfield gives us.
As far is filling in the 3 hole, Youk is so good at hitting anywhere in the lineup. He is slumping right now but I think sticking him in there will plug the hole until Papi hopefully comes back.
If come July he is not ready to go I would also love to see us get Dunn. I know the Reds are saying they aren't trading Griffey, and I know he's old and injury prone, but I still think seeing him in a Sox uni would be the coolest thing, he is my favorite player of all time.