They seem to have started there and gone nowhere. This whole document is essentially devoid of content. To be fair, blockchain-like technologies can be extreme

They seem to have started there and gone nowhere. This whole document is essentially devoid of content. To be fair, blockchain-like technologies can be extremely useful for improving Internet security. See, for example, certificate transparency. (But note that CT does not involve mining and barely involves consensus. I could imagine requiring something like CT for BGP routes, but I could also imagine it going horribly wrong in the event of a need to recover from failure.)