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EM shielded financial pockets are going to become a deal breaker. While there are a few wallets and purses today which offer this (harder on a purse since it makes your phone unusable if stored in it) at some point if your card holder doesn't shield it will be considered impractical.

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Alternatively, simply the popularity of the NFC cards will sort it out. I've got 2 NFC credit cards and 2 NFC public transport cards. They're not compatible with the time-delay enumeration, so you can't scan them separately while they're in the wallet.

These have existed for a while [1]. I've been using one to make sure that my business and personal cards aren't both charged in public transport

[1] https://www.secrid.com/en/

You don't need an expensive wallet, strip of aluminium foil works as great.

NFC uses magnetic antennas/coupling meaning that shielding from one side is enough to block signal.

My solution is to laminate strip of aluminium foil in card form factor.

More on this from Dave Jones at the EEVBlog where he actually tests the attenuation and visualises on an oscilloscope: https://www.youtube.com/watch?v=kp63MZ6RudE

As well as testing an active jammer that's for sale https://www.youtube.com/watch?v=rnOuEFR6qoM

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