You’re just delaying and making the upgrade worse when the time comes. It’s much easier to upgrade now to 11 and then 17 and then 21 rather than try to upgrade from 8 to 27 when 8 is finally EOL.
Whether you perceive there to be no immediate benefit (hint: there is, Java 8 is an antiquated runtime) or not, delaying upgrading until Java 8 EOL is a way larger risk than upgrading now.