This may be Young's swan song, so he may certainly be up for playing for a contender. One concern would be that he took some time off recently to attend to his hospitalized nine-month-old son. I read that his son's condition has improved, but if it's a chronic, his head may not be that much into baseball.
Since he's of little or no use to Philly if they're out of the race, the Red Sox won't have to give up much in personel, probably a lesser prospect. He does have a hefty salary, but I believe Texas is still paying a good portion of it, and the Red Sox might be able to shed a little extra salary by dumping Drew elsewhere.
His current numbers are not all that bad (.280 BA, .350 OPB, .721 OPS), and certainly a big improvement over WMB and Drew. However, he has only hit 2 home runs so far in 64 games. This is coming off of an 8 home run season last year in 156 games with Texas. With Texas and Philly being two good home run hitting parks, it looks like he's lost his pop.
I'm not advocating the Red Sox necessarily make this move, but I think it's something to keep an eye on. WMB is dead weight in the line up right now and I'm not sure that Bogaerts is quite ready to assume such a key role on the team at a new position. Michael Young might look nice hitting in the 7th spot.
Another thought is that he could be a piece in a blockbuster deal that could involve names like Cliff Lee, Paps (although not both together) and Lester and Doubront (again, not both together). WMB could be part of such a deal, and Bailey would be tossed in too.
Just some grist for the mill. Tear it apart if you want. Go ahead, do your worst!