It's on it's way out in some places, but not everywhere. The problem with OCP is that it all comes as a package. It's easy. GIA does produce decent hymnals. It's their original stuff that's not all that great. Although now that Richard Proulx had died, even that should start to go away.
And yeah, I know Bach and Telemann and Hassler were Lutheran . . . but we ignore it. Just like we ignore that the later English Edwardians were really Anglicans, albeit ‘high’.