1. Listen to as many viewpoints as possible 2. Remove the people who are not domain experts 3. Remove the people who are blinded by their own financial interests or ego. 4. Remove the people who are influenced by social pressures ( good and bad ) 5. Assign probabilities to the remaining viewpoints evenly. 6. Repeat steps 1-5 and chart the progression of the probability space.
Currently, It seems 40%+ likely that Bitcoin will end up as an accidental Ponzi scheme with a crash based on late adopters rushing out. But there is also still a 10%+ chance that it replaces gold as a currency hedge for the next 20+ years and 5+ percent chance that it becomes a first class currency.