I think next Floor will be around 500Dollars. The Problem is the Chinese Governence which will decide not to allow BTC anymore and to hurt users very much that are using btc.
There is demand for btc from elsewhere though, India, Venezuela, and we don't yet know whether Europe is going to have another crisis, things arn't good under the surface.
I don't think it will go down to $500. I think the floor is $850.