Seems to me that both the bottom and the top are important numbers, and the bottom number will show a certain level of confidence that is likely to be the more important number...

so gosh, if I were to project out a bit further beyond the one year timeframe, like AlcoHoDL did, I am more certain about how to attempt to calculate the bottom number, but the top number becomes quite a bit more difficult to project out, because it likely becomes exponentially higher than current price and upward trajectories rather than linearly higher than current price and upward trajectories.

So the bottom number would likely average out to be an increase in value of 6%-10% or so per year .. and of course, the more conservative would be at the lower end of that projected percentage appreciation range. 

The upper number would likely attempt to extrapolate from BTC's past performance, but knowing that slope of the upward price moves has some limits, so the slope of the price up has to become somewhat more gradual  with the passage of time and the already increases in price... as many BTC price predictors have been attempting to outline since the beginning of bitcoin's having a market price and the theorizing of s-curve exponential adoption based on networking/metcalfe principles that goes back to 2010-ish and has been subsequently developed and expanded upon based on subsequent data gatherings.