Right what you say. If we will only exchange our crypto currency with fiat currency then in my opinion it is no different than before we know crypto currency. Crypto currency is available to provide convenience that cannot be done by fiat currencies. If we will only exchange it for fiat currency again then we cannot feel the benefits of the crypto currency freely. We better exchange our altcoins with bitcoin than with dollars because in the short term, bitcoin is still one of the potential coins. If we exchange it with a fiat currency then we will be cut off from the crypto currency. But if we keep exchanging for crypto currencies then we can still feel the benefits that this crypto currency brings.