I disagree because we are already using cryptos to buy goods and pay the services. It's already been proven and now it keeps becoming more useful in terms of its function and development. So, I believed that cryptos will be more useful in the coming more years.
People will just have to adapt that is all, if people around the world can use currencies that lose value very rapidly when they are in the middle of an economic crisis then they can use a currency that can go up or that it can go down, I will admit that it will be way easier if the price was stable but when not even 1% of the human population have adopted bitcoin we cannot really ask for bitcoin to be stable when there is so much potential to go up in value when those people realize that bitcoin is their best option to store the value that they have accumulated over the years.
Perhaps if the cryptocurrency is used ubiquitously and Bitcoin will have and use everything, then it will cease to be tied to the dollar and no one will evaluate its price in dollars. After all, it does not matter how the price of Bitcoin has changed in an hour, if a cup of coffee now costs 1000 satoshi and in an hour the same cup of coffee costs the same 1000 satoshi.