"Gold mining is a waste, but that waste is far less than the utility of having gold available as a medium of exchange.
I think the case will be the same for Bitcoin. The utility of the exchanges made possible by Bitcoin will far exceed the cost of electricity used. Therefore, not having Bitcoin would be the net waste."
I think we're long past this point and we have better alternatives to PoW now.
Proof of work was not invented (or envisioned to be used with digital currencies) by Satoshi. It's been around since 1993. I can't really find a reference to prove what I claimed so I would agree I might have been misled to think that. But the truth is that it doesn't matter whether it was taken into account or not, what matters is that you can mine Bitcoin (or do any PoW) using untapped renewable resources (which is why big mining operations are based in places with abundant geothermal/hydropower and very little, if any, population) but you wouldn't be able to do much else in those places.
So where exactly did you read that in the Bitcoin whitepaper? Because everything else is just guessing.