People will feel comfortable using bitcoin when whenever they are paying something they'll have both options of paying in fiat or in cryptos .
People will consider using it when things they always such as groceries , clothes or even cars and houses have price tags with both fiat and bitcoin .
The whole world will be invested in cryptos when every market and every company will adopt it as a payment method and when people won't fear using it anymore ..
But before all of this , people should have essential needs such as food , water and medicines .. and then we'll talk about people having internet in order to be comfortable using bitcoin ..