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> I don't see QUIC taking over from TCP any time soon.

HTTP/3 uses QUIC, so there’s already a substantial amount of production traffic going over it.

https://blog.cloudflare.com/http3-usage-one-year-on/

QUIC is a major functionality improvement, while IPv6 is a capacity improvement. You can do some extremely cool things with QUIC that definitely deserves a post of its own.

Corporate firewalls are going to allow QUIC sometime between never and the heat death of the universe.

Switching over all uses of TCP to QUIC will go even slower than the IPv6 migration. TCP works for most things and is trivial to use so it will continue to get use.

But unlike IPv6 there's few barriers to adoption of QUIC where it really pays, so I expect that QUIC will be adopted by a lot of applications pretty quickly.