So credit card is introduced after the great depression and just after WW2. Thus credit card system has not really been tested in bad situation (well, maybe little in housing crash 2008.) On the other hand, the same can be said about bitcoin, too.
No.
The credit card system is nothing but a first generation electronic money system.
It's already obsolete.
Just not as much obsolete as paper money.
Paper money is not obsolete, most people still use it when they go to the grocery stores, it is useful to have money outside of an electronic system