It isn't really possible to launch a BTC card full anonymous and the reason is quite simple. You have to use Visa/Mastercard/Amex/Discover/... and these companies won't work with you if you can't follow their guidelines.
Oh, I fully understand that, which is why any card which has offered semi-anonymous usage rapidly shut down (at least the ones I was aware of did). I can't see it ever happening for the reasons you state - Mastercard and Visa call all the shots at the moment, and they would never release a card without requiring extensive KYC. It will be an much easier feat to convince retailers to accept crypto, either directly or via a processor like BitPay, than it will be to launch an anonymous debit card.