I mean, you're right. But as someone who primarily loves DC because of the Batfamily, I can't really complain. I'm part of the problem. I actually started reading Deathstroke seriously when it crossed over with Batman and Robin (the Damian/Bruce issues - #4-6, I think). So...it's exactly that kind of person DC is trying to get, I think.
I'm really not a fan of Metal, but I don't like events no matter what character they're focused around. Though if they ever focused an event around Stephanie Brown that didn't involve torturing her to death, that might change.
As for Priest, I don't think he's necessarily being completely cynical about this, though editorial might be. I think Priest genuinely loves Batman, and really wants to write him vs. Slade. And I, for one, am really, really excited to see him do that!