Follows the link for the discussed graph: http://imgur.com/a/t3b1D
The Ethereum proposal discussed : https://github.com/ethereum/EIPs/pull/669
The detailed post from the interviewed author containing the comments on the discussed graph: https://steemit.com/ethereum/@kybarnet/can-you-put-a-price-on-security-let-s-examine-the-history-and-predict-the-future-of-the-ethereum-block-chain-1-2-3-dive
Another interesting link: https://steemit.com/ethereum/@kybarnet/the-most-sophisticated-block-chain-fundamental-analysis-guide-in-history-geared-to-ethereum

Very interesting material, even you are agree or not it makes you think.
Stay cryptic :)