Removing it from the banking system can be done via a executive order and its game over in minutes as you say. But removing its use in society is impossible. There are still crazy people that feel BTC has real value and is a store of wealth and such strange people you cannot convince otherwise. They will continue to use BTC in private in the shadows like meth addicts shooting up in dark alleys.
Still today, Very few Real banks in the world Accepting payment from
Crypto-related activity.
Already, a Kind of partial ban on Crypto Activity is all around the world. The funniest part is that where the Crypto ban is harder, the Biggest user are from that country
en.wikipedia.org
people figure a way out to use crypto.
It is easy to make Law. Just write it down on Paper. But It is very hard to implement. The Internet makes things even harder for the government. From the first day of the Internet Government and authority can not win against "Online piracy". They make law. People figure out new innovative ways for "Online piracy". They ban websites like Megaupload etc, Now people using Telegram and another service for that. It is next to impossible to fight Piracy on Telegram type of service. Gambling, Drug, black market, prostitution Government fighting from them for ages. Still Today No government claim victory over any of these.
“Do I not destroy my enemies when I make them my friends?”
― Abraham Lincoln
If you can not win over something, Just make them your friend. Some countries legalize gambling, drugs, and Prostitution as they know they can not win over them. Even some countries earn tax from this activity also.
In the case of the USA Crypto ban, the Swiss government allowed Finacial Crypto activity and earn money from them as usual.
You see most of the Crypto related Transfers are anonymous. It is very hard to trace which country and who is using
Bitcoin at a large.
The real crypto user is still unknown. as Its Creator Satoshi Nakamoto. Even the mining power hash rate of some of the miners is still unknown. Even major mining pool has anonymous miner. No
KYC in mining operation.
The most trusted source for data on the bitcoin
blockchain.
After A decade also, Bitcoin is in Early-stage.
Price volatality is Diffrent game. But Person to Person money transfer without any central authority is Game Changer.
Same for Electic Car,
Tesla's share price is debatable but the Electic Car tech is a game changer.