I agree, which means they are going to have some serious decision making to do come early June. The 30-day clock for a pitcher's rehab stint is now clicking for Matsuzaka, so they'll need to make a decision by that time. When Matsuzaka returns, someone will need to be either sent down or to the BP.
Bard is stretched out to start now. If he stays in the BP at this time, they risk injury and/or time without him to try and stretch him out later in the year for more starting in the second half. This is why it makes no sense to do that now. I say this while recognizing that his need in the BP is greatest right now, with Bailey returning after the all-star break and Hill returning in the near future. They are kind of between a rock and a hard place. If they trash the idea of him starting this year, they need to restart the process all over next year, with the same limitation on innings cap. I don't think this is a good course of action if the overall goal is to turn him into a starting pitcher they can turn loose for 32 starts a year.
I think they should see what happens with Doubront/Bard/Buchholz over their next handful of starts and make a decision from there. I think the best course of action is to let the top 2 stay in the rotation, send the low man on the totem pole down to Pawtucket to continue starting and work on any lingering performance issues (looking at you Buchholz, right now), and then bring that person back to the rotation when Bard hits his limit as a starting pitcher, moving Bard into the BP to finish the year.