Who knows what the future will bring, but I tend to agree with people who think that ubiquitous peer-to-peer file storage is coming. And soon.
At least one company, Allmydata, Inc., in Mountain View, California, makes one solution available for early adopters. Looks very interesting. It's free in the sense that if you allocate ten units of storage to the project, you get to use one unit free. How much is up to you. (They say it's unlimited, but I suppose that if nothing else you'll run into a bandwidth limitation somewhere along the way.)
I've looked forward to this for several years, ever since reading a paper by an IBM senior genius whose name I didn't retain. He wrote about distributed, encrypted, online storage of materials in a way that would make them immune to censorship. Repressive governments would be helpless to take down sites hostile to their aims because the materials would not exist on any such site - they'd be distributed. I don't recall the specifics of the IBM paper, and I've not been able to find it online, but it struck me as revolutionary, disruptive and cool. I took my hat off to IBM for being in that vanguard.
Anyway, it seems to me that the age of ubiquitous peer-to-peer secure file storage is just about here. Rather than write any more inadequate words on the topic I'll just point to what some other people have written on the topic here, here and here.
I have not installed the Allmydata offering because of the way I use my XP computer, which would require that my contribution to the project be out of service for long periods. When that changes I'll check it out. By then, I predict, we'll all be hearing plenty about this new wave in storage technology.