All it takes for dollars to become worthless to crypto buyers are two small things, that are in development by multiple companies as we speak. The first, gateway/escrow/merchant services as widely adopted as Stripe and Square. And two, stable crypto currencies to trade against. Once those are met, the dollar's value will drop fast, as the fed keeps printing money, and less people keep using it. In the meantime, the money invested in crypto is simply betting on this future.

Everyone bringing up the tulip bubble fails to understand a simple thing about tulips, they are perennials which multiply once planted. So it was only a matter of time until all those planted tulips multiplied exponentially and created mass inflation and over supply. Cryptos on the other hand are not being inflated exponentially, and most have a cap on the max supply.

With that said, there are a flood of new shitcoins being dumped on the market and the ICOs are getting out of hand. But if you do your research and have a good sense of where the future is heading with the internet, blockchain and cryptos, you should be safe.

The best comparison is the dot com boom, most of these cryptos will fail, but a few will rise beyond anyone's expectations. We live in a world owned by what the dot com boom started. That world is going to erode and blockchain and crypto will replace the companies that don't move with it.