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You could say the same thing about any military hardware during a peace-time economy. It’s not a matter if it exists, it’s a matter if the relevant knowledge exists in domestic/friendly industrial base. The U.S. is making more satellites than the rest of the world combined right now.

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It is also a question of spin up time. If the demand suddenly existed to rebuild satellites en masse, the lead time on labor resources is part of the total time to rebuild. It becomes concerning if and only if either a) for strategic reasons the time is inadequate, or b) the lead time requires generational training efforts, e.g. college programs, national initiatives, etc. which can't behave predictably in response to an emergency.

Broadly speaking, sure. But you’re not trying to rebuild every single one. At this point you’re in a war, things move faster, and there are a million unknowns. Under the given scenario, it appears that satellites have lost their usefulness akin to tanks in Ukraine. It’s not a matter if you can build satellites, merely if you can stay ahead of your adversary. At present the U.S. can launch more and faster mass to orbit. I’d be more concerned about that than anything else in the provided scenario.

It's also whether it matters if you have people available to replace the things. Any conflict that gets to the point of taking out satellites will almost certainly trigger Kessler syndrome, at which point whether you can launch any more satellites becomes moot.

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