My logic was that since C&C isn't the core product, banning cards on it makes more sense, because banning cards that a first time player would buy makes no sense.
Anyhow, if it were to happen, I think it still makes sense to keep just the flavor of Haas vs Shaper, but that does go at odds with saving cards from the cycles, since a good 3/4ths of the card pool would miss out on cards saved. If you did save cards, it probably only a couple cards from each faction would get saved. I don't think any of the IDs are problematic (maybe terrible, but not problematic), so I could see them staying. Most of the Lunar IDs I'm fine with losing. I'll always have a soft spot for my buddy Blue Sun, but it's not doing much without Oversight AI anyhow. Leela is also pretty sick, and I think she's one of the better crims atm. The SanSan IDs... Geist is kinda cool, but also kinda plays his own game. Without his set of breakers, it's fine for him to go, probably. Hayley's another great ID, and she's probably one of the only playable Shapers right now, next to Smoke. Who knows what else will be printed in the next 2 years, though. It's probably okay with me to lose all the IDs, because that's one of the points of rotation: to have things leave.
I guess that's kinda where I stand on most of it. I like things leaving. There's lots of cards that I use every day from these cycles, but I love the changes to deck building that it brings. C&C 2.0 can look just like C&C 1.0 =)