nothing, just one country out of ~190 countries in the world will start to fall behind the rest of the world because the rest are adopting bitcoin every day and have already started regulating bitcoin like Japan did earlier this year.
as for price, there may be some turbulence for a short time, less than 2 weeks probably and then things will be back to normal as if nothing had happened!
Exactly, though as big as their influence of the market, countries like Japan and South Korea or even Australia who have embrace bitcoin can take the reign from the Chinese. We already saw what the Japanese can do, they are crazy over bitcoin and don't mind to take it over from the Chinese, if they decided to go from bitcoin friendly, to anti-bitcoin country.
As for the price, it will dip, so the best thing to do is to buy in this situation so I guess its still a win-win for all of us. We will just have to see how deep the impact of their action to the bitcoin market. But for sure, bitcoin price will recover once again and going strong at the end of the year.