Do you have the correct source for this quote? I would like see it.
Hard to earn - this is incorrect. It is very easy to earn provided you have money to buy it - that is speaking in terms of owning it. If you talk in terms of employment salary in bitcoin then its somewhat of a niche here and other freelancing sites with bitcoin as payment mode.
I think a bitcoin based economy will never happen completely. It will always be a mixture of fiat and bitcoin because both have their specific and fundamental properties which serve different needs. Of course some people will never accept crypto and so they will make sure that it never reaches or have difficulty in reaching mainstream.
Information are from the wikipedia. "
https://en.m.wikipedia.org/wiki/Economics_of_bitcoin " . Yes he did his research but is it almost copied from where he/she read it.
Bitcoins have three useful qualities in a currency, according to The Economist in January 2015: they are "hard to earn, limited in supply and easy to verify". Economists define money as a store of value, a medium of exchange and a unit of account, and agree that bitcoin has some way to go to meet all these criteria.
I did not fully trust wikipedia because it can easily edited. I think read more in many different sources which are more trusted so that you'll see yourself different angles regarding crypto and of course your knowledge will widen