As long as you bother to pin the content of course, otherwise you have to hope that someone else does. But if you have to store the data yourself anyway, why not go even simpler and store the content in a folder on your hard drive?
I believe that content addressed storage had to be built open-source because it was ultimately not in anyones corporate interest to further it.
It's interesting to reflect on the kinds of technologies which are clearly possible, but never seem to get built because they don't centralise control. Truly offline apps, and actually working device-to-device networking fall in this bucket I think. Yes, there are power and privacy considerations but it's pretty clear none of the big players want those technologies to take off.