A short comment on percepted “superiority” of PPC.
On a technical basis - yes, sustainability is always the key.
But that did not stop the mankind from developing rapidly by unsustainable consumption of fossil fuels, did it? This is exact analogy of Bitcoin. Exponentially growing in value, because of “over-exploitation” – that is, it is an will be always more and more costly to mine. And markets NEED expensive items! The whole BTC theory is based on scarce availability of 22 million coins only. And markets LOVE that! Thus, real dollars flow into it.
PPC is much more sustainable, but slowly growing and low returns. Much like wind power. Seriously, wind power is a good analogy to PPC. It may be unlimited in the long term, but if you try much more intensively, the returns don’t come back linearily with the investments. It is a safe bet, but a rather dull choice. Markets definitely don’t dig that. Safe bets are for losers (who should not do stock market business anyway), and for old people… who… don’t have that much time left anyway.
My advice is: build resilient, superior network architecture first, not an experiment. Scale it up, no toying around. Prove the reliability. The markets with real dollars will come then. But first, we need to survive the Bitcoin network difficulty mayhem that is in front of us in a few weeks, months.