I do not think the ETH devs will prioritize PoS as long as the Ether price is > $2000. They would probably want to launch it during a recession, then when Ether price rebounds, they can claim 'PoS saved the coin'. They probably don't want to take the risk of crashing the price. The devs are funded by investors. What they want boils down to the coin price going up, regardless of energy consumption. The investors don't care about PoW or PoS.