If the Red Sox don't sign Oswalt, then Wakefield sees time in 2012. What do you think Ben is waiting on? If he's going the garbage pile route, Wakefield fits the bill.
Seriously, what do they expect out of the group? Most of the them had ERAs in the 4s in weaker divisions. Wakefield is relatively healthy, had a 5.12 ERA last year, and can eat innings. With the way the team looks now, the Red Sox need 2-3 of them to perform-- maybe more with injuries. Wakefield is starting to look just as good as any of those guys, assuming he gets considerable rest.
Edit: Just to be clear-- I don't want to this to happen, but quite frankly, they have not made it difficult to earn a spot in this rotation.