Indeed it is a buying opportunity. Unfortunately if all coins change hands, that justifies China government's fear of Bitcoin as a western ideology and thus is a road-block of the next 5 year's bitcoin development in the world - that is, if this government managed to exist for another 5 years.
If this does happen, the resulting redistribution of wealth should not be viewed as the justification for banning it. The west isn't forcing the Chinese people to sell at a loss. If your government prevents your society from advancing along with the rest of the world then you can't blame anything but your government when the rest of the world leaves you behind...
If China and the eastern nations were to ban gold and demand it be exported by a given date, the west would buy it up as quickly as possible. Would gold then be considered a product of western ideology just because the west now controls all of it? Obviously that won't happen but the parallels between Bitcoin and gold are numerous...
I hope the Chinese people can find a balance between loyalty and logic. Good luck, I think the global economy is going to code and China will be one of the first to notice.