Jag - financial bubbles have existed throughout history soley because of the human condition - people just cant help getting caught up in the frenzy of "easy money." Most recently - how many people were saying the same things at the end of the internet boom? No more overnight 23 yr old millionaires or day-trading geniuses for sure. We were going to make sure now that any time we invested in a stock, it was going to be on sound fundamentals with a good business plan. Right.....and what did we do right after the air was let out of the internet bubble? Just put it right back into another bubble in the form of real estate. Yes, unlike internet stocks real estate is a tangible asset, but one huge difference is most internet stocks were not bought on the margin w huge amounts of leverage. Almost every house is. Even more importantly, at least the internet boom in the end created huge amounts of value. Conversely, putting in a granite counter top creates no value other than one time to the guy who put it in.
Its funny - as smart as we think we are, its amazing how susceptible human beings are to making the same mistake over and over. This bubble collapse will cause huge losses, economic strife, congressional hearings, new regulations, and plenty of finger pointing. What it will not do is prevent the formation of new bubbles.