Blitzo, the difference in our base assumptions is that I see the MSDM system as the outgrowth of existing US technology in missile interception, something that is no longer in its state of infancy, if we can rely on the recent tests of SM-2, SM-3, and SM-6 systems. It is merely an existing technology being applied to a new application, something that is relatively low risk.
You and latenlazy, on the other hand, see MSDM as a completely new capability, which is true, but also as a completely new technology, which is false. The biggest limitation on MSDM, in my opinion, is the range of the system. Since it's designed as a type of active chaff, I have to question how much fuel this type of system can store. It could be a 10 km system or a 22 km system, which makes it somewhat difficult to work with.
The other thing is that this technology is intended as a stopgap until laser missile defenses are mature, and the age of BVR / WVR missile warfare is obsolete. This implies that it will be ready before the late 2020s, which is when the J-20 will be functioning in its prime.