Common Sense would be listening to repeated warnings and at least preparing a plan of action to protect btc investors.
There have also been warnings that Bitcoin is only used by criminals, that it's solely a speculative bubble, that it's a ponzi, that the government will shut it down, that it fails as a currency, that it can't scale, that is controlled by China, that it can be killed by quantum computers etc., and I've concluded that all these are stated without further study of the subject.
You say that China forbid mining; I say, why not going one step further and forbid its use too? Maybe even take the heads of the disobedient? Why should the people use a currency that decentralizes the economy when their political regime requires the exact opposite?
Trust to the pigs.
So, here's my counterexample to your assertion: What if China decides to ban
every cryptocurrency, including the PoS ones, as a cause that it's a threat to (their) people?
Satoshi's original whitepaper intended mining to take place in everybody's home (on CPU back then).
True, but they also stated it wouldn't work that way in the long term.
For now, everyone just runs a full network node.
I anticipate there will never be more than 100K nodes, probably less. It will reach an equilibrium where it's not worth it for more nodes to join in. The rest will be lightweight clients, which could be millions.
At equilibrium size, many nodes will be server farms with one or two network nodes that feed the rest of the farm over a LAN.