Approaching all this rationally, I might be wrong but my take is that China is, somewhat sensibly, concerned about the hype around cryptos, particularly ICOs and wants to take measures to make sure people don't lose their life savings in crazy schemes. Reading between the lines, it seems that they are not necessarily opposed to cryptos, but want to increase regulation, and also apply the same regulations that have always applied to conventional order book exchanges to Bitcoin.
This is all being translated into "the-end-is-nigh" doom and gloom and FUD, which to my mind is going to present the biggest buying opportunity in Bitcoin and the credible ICOs for a long time. No doubt China will, in its authoritarian manner, shut down exchanges and crack down on ICOs and the prices will plummet. But if they eventually allow a regulatory framework where exchanges can operate legitimately, watch it skyrocket again. Also, people will eventually realise that governments can ban exchanges, but not the actual Bitcoin or other cryptos, and that there will still be trade through other direct or innovative channels (apps, lightning network, etc).
Logically, this kind of crackdown will eventually happen everywhere. I don't see how anyone thought they would allow a situation where multi-billion dollar exchanges operated in a regulatory vacuum. So there is probably a long downward price spiral going ahead for BTC/Alts/ICOs. But in the long term, it will persist as the genie is out of the bottle and there will be exchanges that operate with government acquiescence or even totally new mechanisms like decentralised distributed exchanges - e.g.
http://www.coinffeine.com ("like BitTorrent for Bitcoins", lol).