Do you think countries worldwide will ban Bitcoin mining due to environmental concerns? If not, why? If mining is banned, do you think Bitcoin will switch to PoS? Will it still survive being a PoW cryptocurrency? Your input will be greatly appreciated. Thanks.
Bitcoin mining energy consumption is just a symptom of possibly (considering environmental concerns raised lately) too cheap energy prices. If energy became 10 times as expensive, difficulty would just adjust, and energy consumption would drop.
Therefore, banning PoW mining would not really be an example of sane politics. Not saying that it won't happen - insane decisions in politics are surprisingly common. But the most reasonable approach towards environmental concerns would be to just tax electrical energy. This way, not only Bitcoin energy consumption would drop, but also energy consumption of other industries that are less transparent about how much energy consume, compared to Bitcoin.