> the other 90% still need work but can’t find it.

Where do all jobs come from? Ultimately they’re created by people, so I wouldn’t worry about there being a demand but no supply.

Jobs are created by desire, and the labor required to fulfill the market's desires. People won't ever stop wanting things.

Our wants today are vastly different from our wants a hundred years ago, and thus the labor pool looks vastly different. We shouldn't make policy decisions based on the assumption that there is a limited lump of labor.