$20,000?
Probably around 6-12 months are the halving (which is 12 months from now). Id say well reach a new ATH between late 2020 & mid 2021.
Its going to be like a rocket from there though, expect to potentially see $100,000 per coin by 2022.
I really do not want to see a sharp rise like that in a short span, if that happens how can you describe it rather than calling it a bubble and the fall from that will be bad on papers too, you can make a lot of money when the price touches those valuation but the general perception of bitcoin will change and people will start seeing it as dump and dumb market and it wont be good for the market, steady growth is what we need to see in this market, but not sure whether we will see that.
Do not worry - this sharp rise, as you call it, will not happen this year. We will avoid the new wave of hype. Bitcoin will grow, but it will do it steadily. The whole process will take a long time.