That's a rather theoretical argument. If you were the sole owner of the world's land, then people would probably resort to kill or capture you to redistribute the land.
Again, I think this is a rather theorerical argument.
Retirement is not solely coupled to the amount of money you have. I personally have aspirations and enough money to not having to work for a few years. And still I work lots of hours to achieve certain goals that have nothing to do with increasing my money.
