As I said the 'sky is black'. You're mistaking the fact that we did 'ok' thereafter as didn't cause any long term harm. Just like asking anyone who bought a house around the mid nineties and say don't you wish you had waited and bought it now instead.
We are not like Bolton/Southampton and alike and even then these clubs had an initial uplift but bad decisions thereafter caused problems which can happen new stadium or not. The Emirates cost Arsenal over 10 times more than what KD would have been to us, hence why they decided to tighten up their belts, but they've continued to spend big after a while, so again a club's fortunes can and will go up and down regardless of a new stadium - man utd are exhibit A.
As for balance on costs we had around a £15 million debt when we were vying for KD, that was closer to 50 by the time the bank decided to call in our loans. So I'm struggling to see how you can say we couldn't manage to have that extra 30 million for something that would generated more income AND which would have been off the books anyhow.