The issue I have is uptake of the entire concept, if it is taking data away and making it owned by the users, big boys such as Facebook and google most likely won’t incorporate it (where would their profits be in a world where they don’t own and control your data). Both being so engrained into most businesses that I deal with.
And then with data itself, unless they make an easy way to transition between old ways of storing data (such as MySQL) why would anyone rebuild their existing programs to suit such a niche market?
I know it may be adopted overtime but it’s such a radical change and ask, and disrupts the already functioning and evolving standards and practices we use.