Imagine a world where we abolish all forms of money and banks as we know it now a days. People are earning and spending in BTC
We can't abolish money. Bitcoin wasn't decreed and what's not decreed cannot be abolished. They could abolish fiat though, which some controversially argue is a form of money. (I said "they", not "we", because it's my impression that not many central bankers frequent SN, and I surely amn't one)
What will be the role of government then; since there would be no taxes, because all transactions will be encrypted and anonymous.
The role of government will be to apologize for centuries of fucking citizens over until it dies in a ditch and is karmically reborn as a blobfish with birth defects putting its mouth near its rectum.
Would it not lead to more corporate crony capitalistic bullshit, since the idea of welfare state would fall apart.
Cronyism and welfare state are two sides of the same coin (no pun intended): statism. The only relevant spectrum is that stretching between statism and freedom, everything else is a lie carefully designed to distract you and keep you enslaved.
Everyone (i mean every single human) would need to have a digital device to store, spend and earn bitcoins on. How will people at the bottom-most layer survive, who can not afford education, electronic devices etc. Some people and even countries depend entirely on cash.
They will come to SN using a borrowed smartphone, make a post explaining their situation, get 10 microsats from generous zappers and buy their own.