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.

But whatever a person forecasts for cryptocurrencies, it’s getting harder to imagine a future without them.

CNBC asked experts from a variety of fields to describe their vision for the currencies 50 years from now. Their answers have been condensed and edited for clarity.

• Ivory Johnson, certified financial planner and founder of Delancey Wealth Management

“Cryptocurrencies will disrupt traditional finance because one of their most attractive utilities is the ability to efficiently transfer payment across borders with little to no cost, delay or foreign currency fluctuations. With respect to bitcoin, 50 years is a long time and bitcoin could either become the world reserve currency or the next AOL that made a lot of people wealthy until it was unseated by better technology.”

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• Frederick Kaufman, author of “The Money Plot: A History of Currency’s
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