Actually I thought this was silly, but if your service provider provided and upstream cdn/cache, I think it could work pretty well. So when you are out of service area, they simply hit the cache.
The argument is that control can't be taken away from you, I suppose. I argue in another comment[0] that peer-caching could mitigate unreliability, but that still leaves the question of how you maintain ownership if other entities are allowed to serve it on your behalf. Is it possible to make yourself reliably globally routable without trusting a third party, or needing their permission?
