Should USD savers be concerned about the rising popularity of cryptocurrencies? I recently took an interest in cryptocurrencies.  Mostly, I'm interested Ethereum and Smart Contracts, but all the news about Bitcoin's rising price has prompted me to study currencies and economics in general.

The next generations are embracing this technology and it's only accelerating.

Should people that have spent a lifetime saving USD be concerned about the impact alternative currencies will have on the future value of their savings?
Considering that the US dollar has lost 90% of its purchasing power over the last 100 years you should be worried regardless of cryptocurrencies.