Could it be possible that China's ban fits in its plan to gain control on crypto market in China?
1/ To temporize during analysing and preparing a regulation
2/ To re-allow Chinese gov-compliant altcoins to the domestic market
3/ Finding a way to still mine BTC while avoiding its massive adoption, promoting an already existing or a newly created crypto
I see China wanting to make a special coin into a major conversion both from bitcoin and all altcoin. This is already done by japan, maybe chinese is a bit late because crypto business is rampant in their country, but ICO ban has strong motive to get there, I think it is not permanent and will be reopened if chinese crypto system is ready as soon as possible.
I think yes the ban can be as temporary and they may be working on it, because in modern time i think crypto currency have more importance specially for countries like Japan, China USA etc, and i am sure that their government may never ignore the fact, therefore we expect that the ban on Crypto currencies in China is temporary.