reminds me of that old joke...
The only problem is that 2nd paragraph, "Just three of the past 15 bull markets..." reminds me too much of that old joke about economists having "sucessfully forecast 15 of the last 3 recessions...". ;-)
The other obvious difference is that last time round with publically traded stocks a lot of the unwashed got burned by unscrupulous companies. This time round its private capital thats out there buying and then raping and pillaging corporate assets. Often their acquisitions are saddled with the debt they incurred borrowing to buy the companies in the first place (allowing the private capital to extract itself from its debts along with a 'modest' profit) and many it seems may never recover from these acts.
Not sure how the bubble plays out in this circumstance but I suspect as ever it will be best to be observing from some distance away with your assets safe in a bunker with you. Hopefully you don't depend on the companies thus 'invested' in or the economy they support... oh wait.