Earlier quoted context omitted.
Not enough people to do they available work. If the youth leave and don’t come back, rural areas slowly die.
I think the cause is the other way around. The villages disappear because there's no work to do, not that there's no people to do work. Modern agriculture, mining, and manufacturing don't employ many people. We already subsidize farmers to not grow so much that they flood the market. It's reasonable that production capacity should shrink and prices rise. Some prices are currently propped up by regulation.
I grew up in a rural area with family farms.
The farms are viable businesses that feed people.
Farmers kids go away to school and few of them return to be farmers, and it’s hard to bring in workers (commute times, lack of housing) so despite there being work, people leave. Technology and automation have played a role but there is more work than people