...compared to say u.s. dollar bills which you can hold in your hand or stuff in your mattress.
this is why bitcoins will not go mainstream because majority of human beings on this planet do not have access to a computer.
successful gold standards are things like toyota trucks, ak-47's, u.s. c-notes which thrive in places like afghanistan and africa.
Just by the amount of BTC available I would find it very hard for the majority of people to own some, but that does not mean it will fail. Even if you do need a certain level of technology to access crypto, other cryptocurrencies could still become mainstream.
I wonder if the same thing happened when plastic (credit / debit cards) was introduced. My guess is that many people thought it would never go mainstream, yet it did.