I think something like this makes sense at some # of users closer to 10-20, or maybe even higher numbers, kind of monkeysphere / Dunbar's number level.

That is, a smaller group of people (an extended family, a neighborhood street, a collective ... fine, a cult) band their resources together to pay for pod hardware to realize some savings / distributed back-up, and have "edge" apps for trusted sharing within the pod, and then P2P (pod-to-pod?) apps for sharing outside the pod.

Right now, the economics just don't quite make sense.