Interestingly, capital holders are complaining all the time as well. There are very few places to put money now with a decent return. Savings accounts pay roughly 0%. Bonds are at inflation, or sometimes less. The S&P 500's P/E is at 25, which is historically very high, implies a rate of return of about 4%, and makes the risk of a correction significant. Real estate is inefficient; property prices are so high that the IRR on rents is only a couple percent.
Basically the only place to get decent returns these days are in startups, which is why valuations have gone sky-high. This in turn cuts the average return, although in tech startups this is manifested as a big chance of losing everything and a small chance of a great return rather than a small chance of losing everything and a big chance at a small return.
I think what's actually going on is a big innovation deficit. We're at the end of the current scientific & technology paradigm, and there's not enough fundamental research going on to generate new technological opportunities. We see this in the returns to innovation (which are sky-high: if you come up with a technical breakthrough that legitimately makes things better for lots of people, you become an insta-billionaire) and the rareness of those returns. Historically, the last time this happened was the Great Depression, and WW2 broke us out of it because the war department funded a good deal of research that could never have happened in peacetime, which were then commercialized over the ensuing 50 years or so.