Well, the insanity part was more the point of that. And that was the point. The design wasn't an awful one, but it wasn't self sustaining. The Incarnae just walked from their responsibilities of sitting at the head, and the system broke down.
I don't disagree that had the Maidens, Luna, and the UCS been paying attention, they would have agreed with the Siddies. However, if they had been paying attention, they could have done something about the problem. The Great Curse isn't completely impossible to deal with. The Infernals, at least, had it removed from them. The Incarnae should know how to do that as well, as they are at least as powerful as the Yozi. Barring that, they could have told the Solar's about it, who could have done something about it, even if was impossible. If the Solars can kill the Primordials, they can kill the Curse they put on them. With their fists. Doing impossible things is their schtick, after all.
That was more just a side point. I was agreeing with you that the Dragonblooded taking over Creation probably wasn't such a bad thing. Things didn't really start sucking until the pissed off Ghosts of the Solars decided to go and kill most of the Dragonblooded, along with most of the Mortal population. The Usurpation broke a lot of things, and pissed off a number of gods. The Siddies made it worse.