That estimation is not that far from the current bitcoin price. I believe that it can hit 5k easily and maybe a little bit more in the second quarter of 2019.
It needs just a stimulus to do so (I don't know what this may be). I think that by the end of 2019 (which is still a short-term estimate) Bitcoin price is going to soar near $ 10,000. It is just my feeling though I cannot relate it to any news.