> yet it is still an obscure tech and will likely end up like IPv6.

Probably. According to Google, IPv6 has a measly 46% of internet traffic now [0], and growing at about 5% per year. QUIC is 40% of Chrome traffic, and is growing at 5% every two years [1]. So yeah, their fates do look similar, which is to say both are headed for world domination in a couple of decades.

[0] https://dnsmadeeasy.com/resources/the-state-of-ipv6-adoption...

[1] https://www.cellstream.com/2025/02/14/an-update-on-quic-adop...

QUIC is already out and in active use. Every major web browser supports it, and it's not like IPv6. There's no fundamental infrastructure change needed to support it since it's built on top of UDP. The end points obviously have to support it, but that's the same as any other protocol built on UDP or TCP (like HTTP, SNMP, etc.).

Your browser is using it when you watch a video on youtube (HTTP/3).

isn't it just http3 now?