Oracle's point of view
A win for Oracle in this case doesn't mean their point-of-view about CRIs or fair-use interop prevails. The precedent value would relate to Google's (Android, Inc.'s) conduct in re-implementing an API without a license.
There are plenty of orgs (W3C, ECMA, ISO, etc.) doing standards work providing for platforms. It's not the end of the world as we know it if either party wins.
Interface code has shipped with copyright notices from earliest days of shared source. Just ask AT&T or the Regents of the University of California. If everyone 'knew' APIs were uncopyrightable, we'd be living in a different world.