1. Bitcoin is more than its price, you know?
2. Bitcoin is not Bitmain's property. I am not convinced how much good and how much bad did actually Bitmain did to Bitcoin (I suspect that they may have even done some of those scary dumps), but Bitcoin will easily survive Bitmain and even more Wu's "reign".
3. If for some reason Bitcoin would fall, there are a number of altcoins which are accepted in quite a lot of places and which would l o v e to take the crown.