We seem to have an entire generation of people who think "stonks can only go up". Similar views were expressed about houses/real estate in 2007. At 47, I'm probably substantially older than the average HN poster, but having lived through the 2001 dotcom implosion and the 2008 financial crisis has given me some perspective. I'm getting some really bad vibes about the sustainability of the the economy and asset markets…
Not that you are necessarily wrong, but I am not sure your examples really show that. The Dow Jones is at an all time high, even adjusting for inflation, and not by a little. Yes, there are dips, but over the long term it seems to hold. As far as I can tell, the following holds true, ∀ t ∈ [1930, now], V(t) > V(t - 30) where V is the inflation-adjusted value of Dow Jones that year.
Certainly, but as Keynes said, "in the long term we're all dead". Less dramatically, average annual returns over long periods of time depend dramatically on when you start and stop the calculation. At some point, people want to retire and live off their savings and "wait another 10 years and you'll recover your principal loss" isn't a comforting message.