I think cryptocurrency will take over a significant share of the market but physical cash in hand will still maintain some value. I worry though that the value of everything that is not cryptocurrency

Sad but true.

Who doesn't love fruit? So sweet and delicious.

Certainly possible that it could take a big share of the market. What is the key to creating a good coin? How does one secure a hypothetical new coin in the ether and what gives it value enough initially