Sure, it will.
And yes, it will be removed from Nixpkgs, so after 18.09 it won’t be possible to setup Oracle web java plugin.
My purpose is to have a persistent browser Java app, that won’t be broken until upstream (online banking and Nixpkgs) stops using client side web Java. Think of concrete browser for specific webpage. Would be extremely cool if it was possible to build some real GUI window with webpage hardcoded.