I think that the same issue that exists for those who choose to store their data in a proprietary database, as it does for those who manage their data with closed-source systems. When an open source program, I'll use truecrypt as an example, stops being developed, it can always be picked up or funded by whoever finds it important enough.
I heard or read someplace that information is the "new" gold, if that's true, then it seems reasonable that people would be concerned about not being in complete control of their personal property like they were when everyone was still relying on paper for data storage.
Data storage in general is a strange business model because the product becomes increasingly more valuable as people place whatever documents they find very important such as pictures, business records, etc. and it's the customer adding all of the most important value. I'd argue that most people care more about their old family/friend pictures than the coolest software innovation out there.
Personally, I'm still waiting for a software developer(s) to come up with a complete solution or at least a robust open source framework that everyone can work off of. The CSV file was a great start, but CEO's have a financial responsibility to their shareholders, helping your competitor is probably a quick way to get your shareholders angry.