With so many good altcoins around, do you think Bitcoin can cross $50k by Dec 2020?
Quite possible. Considering the next halving is nearing, it could happen while supply decreases. However, there are many factors to consider aside from that. Include government regulations, their move to ban/decrease bitcoin activity (by making their own or imposing laws), and possible crisis that might happen because we cannot predict the future. It could pump up to that price because there's really no limit to where bitcoin prices could hit, no institution controls its inflation and it's purely by supply and demand.