I guess it depends on if you care more about the superhero-titles or the characters. I care about the characters. If someone new is in the role - especially someone "surprising" and unrelated - why should I care about them? I'd much rather a new solo character be created to fill a new role instead of ditching the characters I actually already like and am attached to so you can have a new character take someone else's place.
Someone said this a few weeks ago - DC cares about the "roles" rather than the characters. They want Superboy and Robin and Wonder Girl. But they don't care about Donna, Cassie, Kon, Tim, Dick, etc. For me, as a fan, I care about the chracters. Want somethign "new things" - create really new things - new heroes with new hero names that can go on to become their own hero families.
I know I'm in the minority, but I want fewer legacy characters, or at least more time between them. Actually, I'd prefer only kid characters have legacy names, and they get to grow up and get their own identities and names, like Nightwing did. Also think it would help with fan in-fighting. I was disappointed that Bart went from Impulse to Kid Flash and Steph from Spoiler to Batgirl. They gave up the identities they'd forged themselves to take hand-me-downs. And both ones with names that they should change out before 30, anyway.