The tricky part is getting enough developers to put the extra work in to allow the data their app creates and consumes to be interoperable. Without that there’s a lot of friction in supporting interoperability and it will I expect continue to be limited to migration of data between apps, rather than separating the applications from the data.
Solid bet on Linked Data creating the incentive for this but the jury is still out.
Developing with Linked Data is relatively hard compared to rolling your own format, and so we should expect that to limit its use for most apps in the short term. This doesn’t mean Linked Data can’t gain a foothold, and one reason I put effort into Solid on Safe was so we could take advantage of Solid apps to give us a leg up from day one.
The interest from MaidSafe in supporting Linked Data in the network itself can help a lot too, so it continues to be attractive to me because I foresee a massive upside for users and applications once this gets going (see my presentation DevCon talk Supercharging the SAFE Network with Project Solid on that).
Other approaches with the similar goals also exist such as DAT which aims to make adoption easier by emphasizing conversion between different app formats, rather than making semantics implicit in the data.