we heard a lot about mining and how it's affectingcould bitcoin turn to PoS?
I can assure you that bitcoin will never swap PoW for PoS simply because PoS is too flawed and useless and it can basically be categorized as vaporware that is only good for useless shitcoins such as XRP.
with Elon's talk about how PoW is bad,
Illiterate people shouldn't really talk about things they have no knowledge about and you shouldn't waste your time reading the nonsense they say either.