I find that your opinion is correct, as it is now if we sell cryptos that means we buy into fiat currency. The current money has very high inflation so the exchange rate will be reduced over time. Though, the difficulty here is that cryptos are not accepted as an official currency to use in every transaction so we still have to buy fiat currencies to be able to trade everything for personal needs. If future cryptos are accepted, then I will hold and not convert to fiat currencies.