During the dotcom bubble thousands of companies were way over valued, where are they now? Mostly gone. Amazon survived and evolved. They actually were the exception. That doesn't mean every company that you can imagine being in a similar boat to amazon is going to end up in the same boat as amazon or even close to it.

Not to mention when the dotcom bubble popped Amazon's stock price took a beating and didn't really surpass its dotcom bubble peak until fall 2009, 9 years later...