They are concerned because they noticed that Java 8 will stop receiving updates on January 2019, and also support will end starting on March 2022.
Currently, they don't have a Premium, Extended or Sustaining support contract with Oracle.
There are different End of Life Support for Oracle products.
1) Java SE Public Updates
Public updates are released with cumulative fixes or new features for existing versions.
For Java 8 it says:
End of Public Updates Notification
Commercial User End of Public Updates
January 2019 or later
Personal User End of Public Updates
It means, starting on January 2019 you will not receive any other update for the latest Java 8 release, but there will still be support for this product and does not indicate the End Of Life for this product.
2) Oracle Java SE Product Releases / Oracle Java SE Support Roadmap
There will be support for this Java version for different layers until 2025, and sustaining support is indefinite.
As a conclusion, it is safe to continue using the Java 8 JDK as it will still be supported for a long time. Even for other environments and AAOP versions, Java 6 and Java 7 are still being used as they are still supported by Oracle.
As of November 2018, JRE 9 and JRE 11 are not yet supported by any AAOP version 7.x.