A more complete resource than the one I referenced in The Linking Open Data cloud diagram.
I haven’t seen any movement towards solving any of the fundamental identity issues with the LOD cloud.
On the other hand, topic mappers can make use of these URIs as names and specify other data published with those URIs to form an actual identification.
One that is reliably interchangeable with others.
I think the emphasis on URIs being dereferencable.
No one says what happens after a URI is dereferenced but that’s to avoid admitting that a URI is insufficient as an identifier.