$20,000? It would surely reach that price again in my opinion. It's just a matter of when.
So, this could reach up to 20k USD but no time to disclose when. You have a good answer and it is indeed right that BTC will going to reach even more than that but only time could tell. Maybe not in 2018 and maybe it would fall in 2019 or even on 2020 upwards.
P.S. Take my opinion lightly. Not an economic expert or anything. I definitely could be wrong.
Yes I do believe that in discussions like where speculations are only speculations and should not be the reference for one's decision in their crypto holdings.