Yup, and I mentioned that earlier, but nothing is free. More buoys means more weight, along with some version of an ALFS. If you're using a rotary launcher, you now need storage for the "free" buoys not in the launcher. Plus another crewman, like I mentioned (and IKE just said). That's all going to cost cube space, which is going to take a way fuel and rack space (think processors and crew stations). And in this scenario, we're talking about the 280, which isn't huge to begin with, despite it being bigger than a -60.
Again, please understand my earlier post was exactly about embracing new ways to fight a new system, but the reality of existing infrastructure (lots of DDGs and an already overmanned LCS) are also things to consider. Having an extra crewman makes absolute sense operationally, but finding room for them and still able to keep whatever the coverage percentage will be will cost racks. I will say that at least the last two east coast CDREs (and current DCDRE) understand that the future construct isn't defined yet, which is a good thing, as it shows an acceptance for change.