While it is certainly agreeable to address the power requirement issue of Bitcoin's (and others) PoW, you managed to have a quite long writeup without mentioning the single true PoC (Proof of Capacity) coin out there: BURST (https://www.burst-coin.org/)
RE: BitTorrent Creator now working full time on new AltCoin development! This will be Huge! Imagine a File Sharing Bitcoin system or BitTorrent Mining! Also News on other bitcoin plus bittorrent projects like JoyStream and ZeroNet