Here's an interesting thought experiment:
Imagine that everybody has visibility of all of their money on a smartphone app. For simplicity, consider that only dollars and bitcoins exist. The app has two features:
1. It displays the market value of each user's money, expressed in whatever currency is currently "dominant," along with the exchange rate between the two currencies.
2. There is a slider bar that allows each user to dynamically adjust their personal exposure to anywhere between 0% bitcoins and 100% bitcoins:
0% BTC 100% USD <-----|||SLIDERBAR|||-----------------------------------> 100% BTC 0% USD
Assume there is no fee for trading and no slippage. If it was
this easy for everyone, what would people do?
Bitcoin adoption is all about slowly coaxing the world to move that imaginary slider bar a little further to the right!