KEY POINTS
  • It's getting harder to imagine a future without cryptocurrencies.
  • Here are some experts' visions for what the digital coins will look like decades from now.

We may not know what stocks in the S&P 500 will do next month, or in two years, but over the decades, we have a pretty good hunch that they'll go up. Most of us also know what a stock is, and that definition hasn't changed in centuries.

None of that is true, of course, with cryptocurrencies. Some predict the coins will forever change how we understand and interact with money and others warn of a dangerous bubble.