tell that to the folks in Japan who have been waiting 30 years to get their money back. and the Nasdaq is still trading below what it was 14 years ago. I think real estate, art, diamonds, domain names, etc have been a better place of value than stocks over the past 10,20,50,100 years.
just hope the stock market doesn't do one of its 50% drops right before you plan to retire. if you live forever, then being bullish is the right way to go. but with a finite time to live, you can get burned bigtime by being a permabull. you will find out the hard way. i made millions in the 2008 crash and that allowed me to retire.