Fiat currencies are losing their relevance because they print out of control.
As soon as the US prints the next batch of fiat, other countries rush to do the same. This is the path to the depreciation of fiat currencies and the transition to a new financial economy.
Bitcoin is also not eternal, it can also die as soon as it completes its task. But it won't be soon
I do believe that as long as human kind continue to upgrade and develop in the way their life goes the possibility that in future we will encounter another way of revolutionize financial investment like what we have now a cryptocurrency is possible I mean maybe bitcoin could die but maybe it won't. Today we value fiat currency but because the point to point transaction or the utilization of the cryptocurrency was not yet fully implemented in every aspect of our life however people are now open minded to adopt the fast changing technology and also improve their financial aspects so yeah why not hoard a bitcoin if you could have it. In fact this is the smart choice that every person could ever made in their life.