The current driving licence in credit card format has an unrestricted validity. Provided that you own an old blue driving licence, you can keep this either or, however, against a fee (depending on the residence canton) and by submission of the document “application for exchange of the Swiss blue diving licence” exchange it in a drivning licence in credit card format.
Should you however change the canton or your name, the driving licence is issued to you definitively in the credit card format!