How many "over valued" "Amazons" died? Compared to the Unicorns like... well... Amazon? It's like saying "All houses built in 1900 are built SOLID because look

How many "over valued" "Amazons" died? Compared to the Unicorns like... well... Amazon? It's like saying "All houses built in 1900 are built SOLID because look at all the 100 year old houses that still exist" and then completely ignoring all the 100 year old houses that don't exist... Hell, look at the companies that were undervalued. GIANTS! Companies that will never fall... like, say, Blackberry and Palm?