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.

There is no denying that mining bitcoins uses a lot of electricity. Adoption may be impacted by this. Building a system within Bitcoin that enables using a portion of transaction costs as a tax to fund renewable energy projects is one potential approach.
You can contribute 5% of your transaction charge to renewable energy if you are willing to pay outrageous rates for your transaction.