I've never actually gone and confirmed what specifically hinges on ECC, just know I've read in various places that it's everything from banks and credit cards to nuclear missiles.
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The typical answer is that quantum will get it. If quantum takes out ECC it isn't like the encryption on the things that aren't ECC will save us.
Very few quantum ready claims out there so far.
Few, but not zero
Post-quantum cryptography - Wikipedia
Right, but they aren't being used. Not for banking or anything important really.