Great post... I also heard about the story about the Russian plane that lost a good amount of gold. Must be quite a gold rush there now.. haha..
Now to the crypto... Just like you mentioned in this post that the difficulty of mining bitcoin rises, I do believe so would the price. Now imagine in the year of 2020 what would be the difficult of mining a bitcoin... but the demand for the bitcoin will be much higher, as the crypto currencies are not going anywheres... they are here to stay. Now do the math of how long it would take to find a block today, and how long it would take to find a block in 2020... Miners will always be there to mine, think about the demand of bitcoin in 2020...