However, a hotspot in space couldn't coordinate timesharing of all the hotspots in it's radio shadow even if it were possible for it to hear them.
You know more about it than I do, but perhaps this is relevant:
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The signal on the ground will be fairly weak, in order to not interfere with local networks. At this time, we're shooting for receive sensitivity of about -90dBm.
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Correct, in all likelihood the noise floor in modern urban areas will be too dense. As much as we would like everyone to use Outernet, it's really meant for people who would otherwise not have access to information.