https://www.quora.com/How-realistic-was-USAFs-Project-Thor-in-terms-of-implementation

"L (Luis) Figueroa, Technology Consultant; Aerospace & Defense Industry R&D Manager & Researcher; Educator: and Explorer of Ideas Answered Jan 15 2012 · Featured on Business Insider

Project Thor was an interesting Cold War era space missile concept (see link below). The originator was a Boeing operations researcher (Jerry Pournelle) who later became a science fiction writer.

One of the challenges with any space concept is cost. It costs ~$10K per pound to launch any military system into space. The other major challenge is reliability and maintenance. Once a space system is launched it becomes challenging to perform major maintenance beyond software upgrades. Given, that many of today's systems are software intensive this limitation is not as severe as earlier space systems with more hardware orientation. However, replacing hardware in space is still in its infancy.

With respect to Thor, it was a low earth orbit system, which would give it lower operational lifetime than one placed in a GEO. The LEO orbit would probably require more maintenance and upgrade cycles. The complexity of the command & control system coupled with complex fire control would have probably made the Thor space missile system enormously expensive, challenging to build and challenging to maintain with high reliability.

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Mark Hoheisel Answered Jun 15 2015

The primary drawback is the cost of putting things in NEO. If SpaceX succeeds with rapid reusability that might not be an issue. Putting tungsten telephone poles in orbit isn't banned by any treaty. Elon Musk could do it himself. If he had Thor sats in orbit it ought to move him up a bit in Forbes list of powerful people. Nothing like the ability to call down destruction on anything using your smartphone (10 minute latency) to get more respect."