Or they're mistaken in their assessment of what's going to actually happen, as they frequently have been when it comes to technological progress.
The Fed estimates that the wealthiest 10% of Americans hold more than 88% of all available equity in corporations and mutual fund shares (with just the top 1% controlling more than twice as much equity as the bottom 50% of all Americans combined).
And every time it happened the income inequality grew because the savings were mostly going as profits for the top levels of company.
Yes, it hasn't been a disaster, but it clearly set some bad trends going.