I don't really like to target JDK8 as a supported version at work. However, I have to because of large, complex dependencies (some third-party with no source available) that have no drop-in replacements that will work under JDK9 and beyond.

Finding replacements for dependencies (or rewriting them), testing, etc to move to newer versions of Java is a cost the business is not willing to absorb at this point. I expect that eventually when JDK8 has no viable support options and the cost of maintenance becomes too great the business will decide to jettison the whole stack and replace it with something else that likely won't be Java based.