It is impossible for anyone to know the price of bitcoin in the next decades since bitcoin price is unpredictable and past record is not a guarantee that the future will play out the same way.
Your absolutely right and thanks for pointing that out for Dailyscript and other investors who might have misunderstood that part. The probability of knowing what the price of Bitcoin is 0%. We can analyze and with our analysis make predictions on what it may be. Either being idealistic or realistic but all is full of speculation. Our expectation may come through at the end of the day but that doesn't mean we were certain of the price of Bitcoin in the next few years. True investors will know that the value of Bitcoin would worth more in the future, the price is unspecific but sure its going to be worth more in the future.
A new investor only needs to believe in bitcoin after checking the price history of bitcoin and see that the price of bitcoin going up in future has high odds than it going down because bitcoin is still going to mature more and more overtime.
No, i don't expect an investor to believe in Bitcoin by just checking the price of Bitcoin in the past or currently. He must understand the nature of Bitcoin, and grasp knowledge from it. Only then he will have his personal conviction on Bitcoin and believe in it. The price being assured to go up for years than going down is what build trust to choose it as the best asset to invest in. But believing is witnessing. When we start to invest with the knowledge we have and things start working out properly based on our goals, strategies and longevity then we are not true believers because we would rather trust in holding it for more than 10 years rather than trusting it in the short term