Well it would all depend on the enforcement regime wouldn't it ?
I suspect there are some people - maybe even posting here - who would like to see failing to provide an ID card when asked met with summary execution.
However on a serious note, having an ID card scheme is the underpinning of laws that allow the police (to begin with, and dog wardens at the end) to stop you (for no reason) in order to ask you to show your ID card. It would make no difference if they have a reason or not. And if you can't show a valid ID card, then what ? Locked up until you do ?
As I said, a lot of low energy thinking here.
All the police officers I knew growing up weren't keen on the idea. Mainly because once you have logged and recorded someones ID somewhere, it becomes an alibi elsewhere. And the very fact you have "a scheme" means you aren't allowed to question it (because otherwise, what was the point).
They much preferred what we have, which is a variety of ways to establish ID, all of which can be queried and checked and discrepancies noted.
They similarly didn't like the idea of being armed.