I think these systems would also suffer from 2 critical vulnerabilities:
1) ground-based weapons that can take out satellites (e.g., a beam of some sort). Are these possible today? Satellites move fast, but also very predictably, and I think most of the countries against whom these weapons would be used also have the ability to track satellites.
2) space-based anti-satellite weapons. from what I understand, it's much easier to knock out a satellite from space than it is to knock out a missile from space. So satellite-killers would be more effective than the satellites they are killing.
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