I have just skimmed a looong discussion at Hacker News - https://news.ycombinator.com/item?id=22047573 - about a vulnerability so big that NSA was happy to be accredited. (I only wonder whether they spotted someone else using it.)
Do you remember ROCA attack - the most devastating attack in 2017 that extracted secret keys from 25% of TPM module? It has a kind of a sibling - Minerva. While ROCA was about the RSA encryption, MINERVA is about Elliptic Curve (ECC) signing.
If all current encryption were suddenly broken, that would be the end of it for encryption as we know it. With one exception - one-time pad. One-time pad is a provably secure encryption that can’t be broken, but it has practical difficulties - it requires keys as long as the data.
Some people argue that certificate pinning is a must to protect against sophisticated attacks. Some will say that it is a pain in the bottom. But what is it actually?
WiFi routers should pass any traffic transparently unless its configuration is really messed up.
Quantum cryptography is still some years away from being anything but an interesting research area. But if you want to see what it is to suddenly have all your keys broken, look the ROCA vulnerability.