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You don't need to launch the missile from the same point as the detector, you can launch closer to the aircraft. And the b21 is a sub sonic bomber, probably flying about mach 0.8 or so. Even if you needed a lot more missile locations for non hypersonic missiles, it'd still be orders of magnitude cheaper. Seems like carrier groups are about the only target valuable enough to spend a hypersonic on.
I am aware. Good luck getting those installations close when you detect it after it's already too late.
Doubt. Logistics, munitions stockpiles, and crew to station them would more than likely add up to a lot more than just the cost of the missile. Even then a cheaper SAHR or even a more modern AHR missile may miss due low RF reflectivity from the stealth aircraft. It would stand to reason that a new hypersonic missile would have different or upgraded sensors that may stand a chance to track a LO aircraft once it's close enough. But all this is assuming they were even able to track it at all