The new coin will not get rid of forgeries completely, at least not until the old is removed from circulation. In pure money terms, it's not worth it. But since

The new coin will not get rid of forgeries completely, at least not until the old is removed from circulation. In pure money terms, it's not worth it. But since they're printing money anyway, I guess if it's too costly, they can just print more money to pay for it ;)