For now, I think the price of BTC is unable to return to 20,000 US dollars, because the sharp drop in BTC prices, which has hit the confidence of investors, it will take a long time to recover. But I think in March 2018 may be close to 20,000 US dollars price.
But the question is, is this possible to be 20000$ again, which is tend to be yes. It may take few months but the dact that this is a volatile platform again, we must believe that it will okay again and continue to move forward.