That's how I interpret it too. I guess Tim Rice is sort of using shorthand for a (very short) list of similar items, a bit like how "Mary ordered the chicken, Lee the carbonara, and Tom the soup" stands in for "Mary ordered the chicken, Lee ordered the carbonara, and Tom ordered the soup". But I do remember being confused by the lyric back in the day. I heard it as "She is the constant. We, who don't care, ..." and I was left thinking, "What about those who don't care? Finish the sentence!"