Had you heard of Zach Stewart before the Sox traded for him? I hadn't either, but he was at one point the Blue Jays best prospect and has been involved in a few good trades. He's only 25, is cost controlled until 2018, and has a few really good starts under his belt at the MLB level (along with some very poor ones) to complement pretty good minor league numbers.
I would argue that Cherington is ahead of the curve on this discussion, actually. The addition of guys like Mortenson, Malencon, Stewart, etc., all show that he values cost-controlled young pitching pretty highly. Rome wasn't built in a day and neither will be the next generation pitching staff.
Let's keep our fingers crossed that Buchholz gets healthy and returns to form as a good pitcher, Doubront remains viable, and Barnes progress through the minors pretty quickly. One more decent SP from the minors (Britton, Ranaudo, etc.,) and the Sox will be in much better shape for a big FA acquisition after 2014.