"Plastics" as you put it still bring valuable revenue into the club. I don't actually think "Plastics" or "Hardcore" fans made the difference, the sole reason is moving to the kc where support was diluted, because the singers all sit in different parts of the new ground.
It's good the plastics bring money into the club but they are the reason the home support is so diluted, I agree a little bit that support was broken up a bit when we moved to the KC but we've been there long enough now for it to have worked itself out, the fact is the last three seasons have seen the home support taken over by season-ticket holders who probably get bored when the team doesn't play like Barcelona every game, they paid their money and if they want to make the atmosphere morgue-like then that's up to them. It needs sorting out.