I dont think that Bitcoin will hit $20k, but going deeper than $40k is easy. Nearly any global negative case that happens in the world steals a thousand from Bitcoins price, while during daily trading Bitcoins manages to recover only several hundreds. On the road to $100k, after current price drop recovers, there will be an another huge drop. As those who has bought Bitcoin with the price close to ATH, will withdraw their crypto to fiat and will cry that crypto is a bubble or fake.