BOAC
If the ops manager also acts as a line pilot from time to time, then the obvious need for CRM training is met by the fact that all crew members require it.
However, if the ops manager no longer holds a licence or is not a pilot at all, then their attendance at a CRM course may be detremental, as I've seen myself. CRM should allow discussion on the difficulties faced by crew and how to overcome those issues - very hard to do, especially for new guys, when the boss is right there.
CRM, in it's "Crew" format, should be tailored, IMO, to the flight crew only (pilots, F/A and in some companies, dispatchers).
Diluting it to non-flying employees or those with no operational concerns to the actual flight creates a situation where the course applies to everyone, but benefits no one. I've seen this at my own company and am on the development team for our new courses, which we are taking in this direction.
Also, if anyone gets the chance to look at or take the C\L\R course (Command, Leadership, Resource Management) that united airlines (and others) put on - do it! It's a refreshing take on the CRM concept that is much more applicable to that "flight crew" group I mentioned earlier.