In contrast to mass conventional wisdom, I believe that owning a single bitcoin will rapidly become impossible for the average person in a developed country. Prices have been increasing on average 10x per year, and according to a logistic model of bitcoin adoption that I maintain, that astounding rate of increase will continue year by year until the half way point of adoption, at which the rate of increase rapidly diminishes.

Anyone here should have some idea how far, far away we are from the half way point of adoption. Assume some portion of transacting entities, i.e. persons, businesses and governments, will ever use bitcoin - and some portion never will. How many years will it take for the former portion to have half its members adopt bitcoin?

I believe the average person in this world having a single bitcoin will be among the wealthy persons in their respective city. It is difficult to imagine such a situation given the current price of a bitcoin - yet the great temptation will be to spend it too soon, i.e. within four years of purchase.