**plot twist* in 2140 ( also the last halving year) bitcoin will not run out but it's the estimated year that all 21 million existing bitcoins will be mined resulting in no new digital coins being created, impacting bitcoin miners as the reward to mine bitcoin goes to zero (halving), but they may still make income from transaction fees.*
another important thing to note is that bitcoin distinguishes itself from currencies that are not backed by commodities like gold by being a smart alternative with it's capped supply. money gets printed, the more money in the system the less valuable it becomes. bitcoin does not get created freely making it more valuable.
this article is really more about exploring the other supply dynamics more than demand, that influence bitcoin and the key players in the markets.