I think what you are really saying is the physical card will be obsolete. Well, that might be the case in the near future since most banks and e-wallets are transitioning to QR code. By having only QR code which is in your phone, it is more convenient for the consumer and no need to hold or get a physical card for transaction.
It will not become obsolete really fast, I'm pretty sure that plastic cards usage and utility won't ever be gone for a really long time, and there's going to be a lot of people that will never see the point of using cryptocurrency for their daily transaction, I'm sure that some people would still find credit cards and debit cards as a more convenient way to do transaction, the end that you guys are saying isn't something that will happen in 10 years or 20 years, it's definitely going to end in 50 years time or higher but by that time, we're also probably not using any cryptocurrency or bitcoin for transaction, we would probably have another way to do things.