In the short term, while the technology is still pretty new, perhaps. But that would assume an agility on the part of the people building the targeted missiles

In the short term, while the technology is still pretty new, perhaps. But that would assume an agility on the part of the people building the targeted missiles that I'm pretty sure only players like Russia and China can offer, and we don't want to get into a shooting war with them, anyway. For most of the other states (or non-state actors) that we might be exchanging fire with, that's out of their reach, making this a potentially very cheap (relatively) and effective countermeasure. Moreover, if battlefield lasers follow the growth-curve of most other technologies, they will quickly reach a point where, not only is adding power to the lasers easier than adding armor to the missiles, the amount of additional mass required becomes infeasible.