And that's why (one of the reasons) bitcoin won't be used to buy coffee.
And you won't need to make transactions with bitcoin, because it will be used (more and more often in the future) as an investment tool. Have you seen investors transferring shares, for example, SNP500 back and forth every week?
We will probably see $100 (or so) commissions at bitcoin's price of $1M. Do you think anyone will be very upset about this? Unlikely, because everyone will go crazy with delight at the price at that moment.
Because people would still see it as the thing they see today - a store of value and an investment mechanism.
