When will we switch from traditional money to cryptocurrencies?
When we all realize just how superior and easy and convenient and secure crypto is. We all did the switch from cash to digital for the very same reasons, remember?
Money in our card and phone made us less vulnerable to pickpockets. Made it easier to count change and pay instantly. And kept our details safe. When we learn crypto is even all that and more, plus cheaper and more responsible. Oh the switch will happen.
There are old and new generations, elderly and youngsters and they have different needs, different habits. Cash or digital currencies, mobile devices won't be able to change all of them and convince them to stop their use of cash. Some will still use cash but the number of digital currency users will increase.
It is not different much with paper book and ebook, email and traditional mail.
With cash, pickpocket can be a risk. With digital currencies, malware, trojans and online threats can steal crypto.
I am not sure this will ever happen for many reasons, and all governments would never allow it unless they are centralized and they have full control over them, but we can use them as reserve currencies.
More people need to see how bad fiat money can be with inflation and se potential of cryptocurrencies like Bitcoin, and maybe they are not perfect but they are better than fiat in may ways.
Switch does not mean elimination of cash. Cash and digital currency will exist together in human civilization.