It's not so much that you run out of property, but that you run out of ability to expand your customer base fast enough to see fast growth, and the slower growth capitalists can get from external factors, such as new markets, the more incentives they have to look to internal factors to maintain their competitive advantage.
Ultimately that means addressing labour costs. For an individual capitalist it makes sense to drive labour costs towards zero. But if everyone does it, then their markets shrink unless there are external factors (e.g. UBI or similar) that counters the market-wide effects of their reduction in labor costs.
This is also why UBI is a "liberal" (in the classical, not US sense) policy, and not something the socialist left is very interested in - from a socialist point of view UBI is bread and circus to keep capitalism from imploding.
Ultimately that means addressing labour costs. For an individual capitalist it makes sense to drive labour costs towards zero. But if everyone does it, then their markets shrink unless there are external factors (e.g. UBI or similar) that counters the market-wide effects of their reduction in labor costs.
This is also why UBI is a "liberal" (in the classical, not US sense) policy, and not something the socialist left is very interested in - from a socialist point of view UBI is bread and circus to keep capitalism from imploding.