Bitcoin will be very difficult to change this world and the application in daily life is still a very difficult issue for this market. Maybe BTC, ETH, XRP can replace payment facilities but it will not be applied much in society so we do not be too confident in this. Personally, I will still choose Fiat because it determines the existence of the world and Crypto coins are just an investment to make a profit.
Honestly we cannot predict in the future, indeed crypto has not been widely applied in society, but we cannot lie that knowledge about crypto in society is very minimal and they are still not evenly familiar with it. This reminds me of the presence of the internet for the first time and many people who doubt and consider it unimportant, but after all these years the internet is growing, popular and becoming a necessity like today.
I am sure that crypto will become a problem solver in the payment system, to be better than conventional systems like today.
Putting a specific date when mainstream adoption can happen for some cryptocurrency is just a big waste of time as there is no need to put a deadline or a time frame for this to happen. Everything about this matter especially its pace will all determined by the market. Now, we all know that because cryptocurrencies are decentralized there is nobody funding its marketing campaign and mostly we are all relying on word-of-mouth power and some occasional positive media coverage. It is good to think that soon the dream can be a big reality but then we have to be realistic.