Golden rule to get exploited
There's a timing argument - that unless you're at risk of zero days (like you're the DOD) - that you probably don't need to upgrade immediately. But it seems unarguable to me that the longer you wait, the greater the risk from a security perspective.
As always, security is a trade off. Risk of breaking from an update has to be balanced against risk of exploit. I'd argue the latter is going up more quickly than the former.
on a more serious note though I don't think machines with ipv6 enabled that are behind a NAT are likely to be vulnerable to this, i suppose maybe wormable if you can natpunch through some p2p voip or gaming service, it's the sort of patch i would probably install if i were made aware of it (if i had ipv6 enabled), but being made aware of it doesn't like, leave me worried, and i don't consider it to be likely to affect me unpatched
Would you be interested in educate yourself about IPv6?
I suspect it's because I don't use many common software packages so the attack surface is small-ish.
Agree in general that people wildly overestimate the risk leaving things alone. e.g. nginx hasn't had a security advisory affecting basic http 1.1 serving static content without TLS in many years. And of course desktops are behind stateful firewalls.