One argument would be that if someone doesn't have the opportunity to provide for themselves through farming then they have no choice but to work for someone el

One argument would be that if someone doesn't have the opportunity to provide for themselves through farming then they have no choice but to work for someone else. That then means that their labor is no longer freely exchanged which is supposed to be the core of Capitalism. However, my understanding is that Georgism generally applies its arguments to natural resources in general; it's just that land has traditionally been the most important natural resource. You could also probably extend its arguments to other forms of economic rent.