Are they already vulnerable to RCE as an unprivileged user? Hopefully not.
An LPE only allows an attacker who can already execute code on the system to become root. So, bad, yes, but it doesn't mean you are immediately pwned.
Should I rush to Lambda or ECS and turn off all my containers sharing a host with who the hell knows?
And for a single user desktop, an LPE is almost meaningless as all the really important files are in $HOME and accessible without root.