No, no it certainly would-fucking-not.
Fortunately for the rest of the world it's illegal for the same reason google isn't allowed to pay your salary in google bux, and facebook isn't allowed to pay your salary in facebux.
Good thing there's stuff like laws people much smarter than you happened to enact before you were born so you didn't grow up one day and soil yourselves while they retired.
Cryptocurrency isn't going to the masses. It's going to broke AF basement dwelling creeps who don't realize that there's still a world going on outside of the internet, where most of the people are.
There are more than 3 billion people on the internet. The main reason the other 4 billion people aren't on the internet is poverty. While there will always be a world outside of the internet, you'll be kidding yourself if you think that brick and mortar stores are going to outcompete the likes of Amazon.com and other ecommerce platforms.
https://www.youtube.com/watch?v=6MnQJFEVY7s