Bitcoins and other cryptos will never become mainstream before... people can buy water bottles with them.
Quite simple, many expecting an explosive entropy of the bitcoin adoption / price but truth is the average folk most common needs and use of money aren't met by bitcoin, this fact goes against the very foundation of any successfully implemented mean of money anytime across recorded history. It really is a political problem at it's core, the deep states run by bankers won't let a viable alternative co-exist in the streets. I have no doubt that with truly liberal and free alien civilizations, the blockchain technology would have attained (for all purposes) universal adoption in a shorter time that the cryptos have been around by now here.
What are your takes about that sentiment?
I think it's too early to say that crypto will not become mainstream, of course cash is still king, but there are some countries that accepts bitcoin as a payment method and uses LN for that. But it seems that your argument though that bitcoin will be like replacing cash, it will not happen in my opinion. At least give bitcoin a decade to progress, we barely touches the surface as what it can do, and it is still in it's infancy and very young.
If we compare it to the internet, it's the same process, no one wanted to touch and adapt it. But when they realised it's potential, it suddenly exploded late 2000. Same thing with Google, and other technologies that were not adapted early, but now it is part of our lives.