I am not in retail, so I'm not sure about all of the details of the ATM vs. Debit Card issues, however, I was surprised to learn recently how many of our customers still have only ATM cards, and don't want debit cards. When I asked why (since it makes sense to me to just have a debit card) I was told that we have some customers who only have savings accounts, and that to issue a debit card, a customer has to have a checking account (though you can still attach the savings account to the card for ATM transactions; but debit transactions will come out of the checking account).
I'm not sure if this is a MasterCard rule, or our ATM processor's rule, or perhaps it's only our internal bank policy... but that's the only issue I can think of.
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My opinions are my own and do not necessarily reflect the opinions of my employer.