For all of those you like to say HODL.
If you wait long enough it will bounce back.
As an example look at the Dow Jones stock index.
If you bought in 1929 just before the downturn you had to HODL for 30 years until the price was back where you bought it
If you bought in 1966 just before the downturn you also had to HODL for 30 years until the price was back where you bought it
Don't believe it? see for yourself:
http://www.macrotrends.net/1319/dow-jones-100-year-historical-chartAre you willing to HODL when the price goes down and risk having to wait 30 years to get back up?
The rules of the games have changed to what its traditionally obtainable in the finance world. The reference you made is not applicable to bitcoin or digital currency rather to stocks whose price increase is greatly regulated. The directors of the companies involved would have taken care of their families to generations before thinking of doing activities that could increase the market value of their shares and the cumulative of this to have effect will take the 30years.
But in the case of bitcoin, no one is given that authority so the forces of demand and supply are allowed to play their role to the fullest with individuals being the determinants of the direction with all this, I don't think it's informed to compared the two.
