Imagine that after ppl have burnt their fingers using toasters the state decides to ban toasters. A week later online shops have to stop business within 2 weeks. Some online shops may stay in business for an additional month because they've never sold toasters....
your analogy is wrong.
people never burnt their fingers with toasters. instead it was shops selling toasters illegally without license to sell toasters! so the government came to them and said "who let you sell toasters, we are closing you down". and people continued using toasters and buying toasters from those shops that had the license.
The idea of license exchanges in China

, USA has already done it when they forced exchanges to be licensed, pay an extra money.
There are a lot of speculation about China government and it's become a bigger issue since the biggest mining pools are located in there. That's why we need other countries which there are bitcoiners (not always the govs) to create another big mining pools such as Russia and Japan who created 7nm ASICs for a better mining activity, hopefully they could surpass mining pools in China.
[1]
http://kryptomoney.com/russia-set-challenge-china-bitcoin-mining-sector/[2]
https://news.bitcoin.com/7nm-asics-will-bring-bitcoin-mining-to-a-whole-new-level/