I have some interest in keeping Mansion canon, just because there were some more stories I wanted to tell but most of them are wrapping up right now. I think it'd also be tempting to restart and come up with new plots. Give me a chance to do everything better. That's a very tempting possibility so I wouldn't mind starting over.
I know I wouldn't want a focus on just one team, if only because I have a lot of loud characters in my head. There's also just so much more story telling capabilities when you have more characters and teams.
As for DC/Marvel, well I'm completely new to DC, as you know. I'd join it but I'd have some trouble figuring out how things might be different.