Go to any local supermarket and see which currency they are completely comfortable with. It is always cash and will be cash for at least a hundred years in the future. Digital payments have go up but it still uses the same fiat currency in the background - just that the payment method is easier and you would not need the cash physically.
In such situations bitcoin is least known in some countries but might be popular in few, but it is not so in some. Things might change in future, but we only represent a small subset of the world's population.
Duh. Old people often use cash to pay at a supermarket. It would be dumb to avoid cash payments altogether. A full transition into the digital era is going to take a little longer than expected. Young people are already used to making digital payments, so cash's days are numbered. This is the future. In such situations bitcoin is least known in some countries but might be popular in few, but it is not so in some. Things might change in future, but we only represent a small subset of the world's population.
What concerns me is CBDCs' lack of privacy. Luckily for us, there will be alternatives to help us resist government surveillance. I wonder what will criminals use once cash goes extinct? Monero or physical gold/silver coins? If there's no Internet or power, the last choice would be best. I guess privacy and freedom will win after all.
But if that grows, with time, in a decade or two, we could see majority of places not accepting cash, because there is no benefit of accepting cash, we are going to end up with cards paid all over.