All the blockchain ideas are incredibly stupid. It's like a law of nature. Just take any idea, add "blockchain", "sovereign", "decentralized" and it becomes instantly trendy.

No, blockchain won't help you to establish your identity. It's your private key that you use to sign blockchain updates that establishes it. And if your key is stolen then it's game over for you - somebody ELSE will be owning your identity. Forever. With no recourse for you.

All realistic proposals (including the one in TFA) include key revocation protocols through some kind of central authority (i.e. government), at which point the whole system becomes indistinguishable from a simple centralized database.