> Old JDK versions have been kept the same, and Java 7 & 8 are still in heavy use.
But they aren't getting free security updates.
> Not everyone needs enterprise support.
Run it without security patches? That's suicidal for a system like JWS.
Or do you think there's some option that is still support but not specifically enterprise and doesn't cost anything? I would take a look at who historically contributes security patches to OpenJDK and think about if you free vendor really has the expertise you think they do to keep up with security attacks.
People still use Python 2.7.