Don't get me wrong I think the principles behind it and the right to privacy is great and Crypto allows us to have that to varying degrees, but in reality the whole bank and card thing IMO is a pipe dream.
There are lots of reasons that people would want privacy outside of the typical dark market transactions. Asset protection for one and tax planning strategies. I know wealthy Americans with offshore bank accounts who fully disclose the accounts to the IRS as per the tax law but still their assets are shielded by trusts. This makes sense for so many reasons for many people, especially the wealthy.