This would be great.
I have to wonder, though, Obsidian games are not often all that kid-friendly. Lots of talking and deep mechanics, not a lot of twitchy, colourful stuff. I don't think Nickelodeon would trust Obsidian with a franchise like Avatar, that despite being awesome and having a large fanbase among adults is still very much targeted towards kids.
In fact, I'd be surprised if any franchise geared towards kids would be given to Obsidian. So that begs the question, are there any large animation franchises that aren't squarely aimed at kids? I think you'll end up with just comedy shows like South Park, The Simpsons, Family Guy, etc., but that doesn't seem like a great fit either. Though they might allow MCA to finally make that High School RPG he was always asking for.
Man, I think I butchered my punctuation in this post. It just doesn't feel right.