I think the ppl that sold at $11k will now be buying at $9k~. It's just a matter of days before it goes back up and beyond.
This is not like the bitcoin of the past, where a few Chinese players could manipulate the market so easily. Now btc is being used more as currency by multiple countries, which will help stabilize it and make it grow. It's the investors that pump and dump and cause wild fluctuations like this. However, since there's more regular users and countries involved, we shouldn't see massive drops like we have in the beginning.