That is exactly what would happen. This is another Trump idea that sounds good when you say it but anyone who puts any thought into it finds very quickly it is a terrible idea. Everything he says is about getting people to like him. He says something like this so people will say "that will help me, Donald Trump is a good guy and on my side". Meanwhile, if it happens, most of those same people will have their credit cards cancelled or not be able to get a card to begin with. He can then say it is all the banks faults not his. Trump is nothing but optics, once you look past the words and actually at how things works, everything falls apart.