It's impossible for Bitcoin to fall , USD is presented to the economy of United State- which is the best economy in the world. So if USD is fallen , i think it's not gonna be a good result to US too.
I think will have an impact on the price bitcoin, we can see the fall of rupees in India therefore, the price bitcoin to $ 1000 we can imagine if the price USD fall of bitcoin will increase more than today, many people save values whealty in bitcoin. and I think it will make the price bitcoin increased if USD fall