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Rotating numbers are still extremely viable with fixed card numbers - it's possible to issue a set of semi-permenant printed numbers and also offer a tool that can issue additional digits for untrustworthy retailers or strange one-off payments. The removal of digits from the card itself is a cost being levied on the customer and it provides no real benefit.

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Removal of digits reduces reissuances which are annoying for both issuer and customer.

Cards are moving towards no card at all i.e. virtual cards. USA is very slow in adopting new payment technology compared to the rest of the world. I live in South Africa and tap to pay is so much of a thing that you do not have to worry if you leave your card at home as you can tap at like 80% of the merchants, and if you can't they will have a fall back like QR code etc, NFC enabled cards have been around for years and all the merchants are really quick in adopting them.

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