2) My patent is about something like this. Sure, it works, I actually did this with NFCs and an Andriod app. But it's a heck of a lot easier just to ask a REST API who owns this NFC. Tamper proofing can be done using pieces of bitcoin (like ECDSA) without using the blockchain. Then you're just back to using a PKI.
3) The question is whether there's anything actually new here. Computers came to wall street a long, long time ago. You'd think most of the gains have already been made. Back office has been decimated over recent decades. It might continue, sure, I'm open to that suggestion.
I'm not declaring a bust; I think something will come of it. But the things I've seen up to now don't seem to need it. Something like that DNS idea, that wasn't bad. But I do see a lot of business types hyping the blockchain, and I don't think it's entirely thought through.