Are there any optimists left? Is $100K still possible even by 2020 or 2021?
I dont see why it isnt possible. At this point, that may be an unlikely target, but I definitely would not rule it out.
What we have to remember is that the 2013/2014 crash lasted for a couple of years before the recovery. That could happen this time. But even if Bitcoin takes 2 years to get back to $20,000, we could then see another spike in price up to $100,000 or higher right afterwards.