Not stable, persistent, global networking, which is absolutely mandatory for cryptocurrency to function. Ad hoc local networking may still exist sporadically i

Not stable, persistent, global networking, which is absolutely mandatory for cryptocurrency to function. Ad hoc local networking may still exist sporadically in a world in which the USD or fiat in general completely collapses, but that's woefully inadequate for supporting cryptocurrency usage. It also completely defeats the point of decentralization and trust less transactions. If an isolated community is ad hoc networking, they are, by definition, centralized, and extremely likely to be a high trust community. It's much more likely they have a far better means of transacting with one another.