Right now we observe that there are some PoS systems that consume almost no electricity but have not been successfully attacked yet (and the reward is very appealing).
How wonderful! I suppose, in that case, we don't need to change Bitcoin after all. People who prefer PoS can simply use the already existing PoS systems. I guess you've put an end to this discussion once and for all. Bravo!
Laws of Economics are not universal, they are environment dependent. Change environment (this is what cryptos do) and you will change the laws.
And of course he can write his own textbook on economics.