Can you predict what will be the cost per Bitcoin by 2019 Dec?
My Prediction: Around $35,000-$40,000 USD
I think $20,000 is a reasonable 2019 threshold, but even at that price, it might be very volatile too, like it was in 2017. However, next year's halving is a big fundamental, so who knows, even $50,000 may be a reality this year.
Honestly I don't think we might reach 35k or 40k USD but $20k which you have suggested is pretty reasonable looking at current affairs and I am sure we will become too mainstream again like it happened in the December 2017. I am not sure about anything more than 20k USD.