No, because none of your customers currently have the service, you will need to treat each of them as a "newbie." The 45 day period was used for the effective date of the rule because there are a lot of banks who had customers already in overdraft service for cards.
If you decide to offer overdraft service for card-accessible accounts beginning 1/1/2011, you'll need to solicit each existing account or advertise the availability and only activate the service for consumers who actually opt in.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8