I would think cats would be a problem there too, yes?

My experience (east coast and Oregon) is that coyotes will sneak up on any tom, gobbling or not. Toms tend to stick to their leks, and therefore the dogs and cats (bobcats in the east) can pattern the birds.

Thus, I think it's the strutting more than anything. I've seen yotes stalk silent toms, the gobbler simply doesn't see the yote approaching - and the yotes have learned to close ground when the backside of the fan is facing them...

I'm not sure about SoCal, but horned owls also take a fair share of foolish jakes right off the limb in the Northeast...