I think it's interesting that we seem to be projecting our biases on these quotes. When I read that same passage (the whole "we started as a duo and will it that way"), my initial thought was, "yeah, that's cool, that makes sense." I didn't find it demeaning at all. That said, I've had a positive association with CB specifically since she used to blog for NPR, and I've read her book. So maybe everything I'm reading about this split is colored by that pro-CB bias.
And while I've always thought of Janet as "unimpeachable," at least on the surface it's hard to condone what she did (abruptly quit on the band ahead of a tour). If anything, CT and CB seem to be fairly understanding, if that passage about "we wouldn't want her to stick around and be unhappy" is to be believed.
My final note on biases is that I'm a guy, so it's possible that subtle digs just go way over my head.