Brenda is the only WMD GH has left, and I say that as someone who couldn't stand her a lot of the time. But even Brenda can't get this show out of the doldrums as long as Frank is controlling the show and it's kept in a sort of perpetual undead limbo creatively, which it has been for most of the last decade. When it's not bad it's mostly terribly boring, and it's usually both. They don't invest in quality, so they can't support Brenda or anyone else to the full extent of their capability.
If they somehow get a major creative overhaul (which they won't) and Vanessa, then I'd be curious. But I don't think the former will happen as long as the show is on network television. GH today is just filling space.