> 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...