What to make of it now? There's both colors of swans at work in terms of the plague, excessive money printing, per Peter Turchin (cliodynamics) a peaking cycle in civic unrest, a potential loss of reserve currency status, big changes in tech that still haven't been digested, low cost of transactions. Lotsa opportunities for froth.
I'm still uncomfortable with it as a store of value. Not many people even owned stocks in the past, which makes historical comparisons a little problematic. It took things like the government heavily encouraging parking money there (401k, IRA, tax law changes, corporate tax law) and greater ease of transaction to put us where we are. You could argue that the entire market is a mania.
edit: Just to indulge my logorrhea for a minute, I wonder to what extent we are seeing an organic change in stock markets, a form of evolution really, that takes advantage of human nature. In the last 40 years or so, it was bound to gather up all the accoutrements of video poker. Marketing and blinkenlights, random payoffs, a house percentage getting scraped off, the fiction of player skill. The payoff is greater than 100% due to it riding the back of GDP growth (and the growth of large companies at the expense of the small) but the science of the casino is built deeply in the human psyche. The stock market has to act the way it does simply to remain attractive to all the primates.