This is assuming there isn't a good reason why we might want some percentage of the population to be rural. To have farms and ranches, for example.
Trying to create an elaborate regulatory regime to decide who is justified to live in a rural area is absurd and a waste of money. Especially considering that most people living in rural areas are either employed in a necessary industry that needs to be rural, or work in professional or service industries either directly supporting said rural industry (e.g. tractor repair) or indirectly supporting it's workforce.
Furthermore, the marginal cost of providing broadband to all those "slightly-less-necessarily-rural" people is minuscule. Skipping every other house doesn't save you much when the majority of the cost is building infra to get broadband to the town/road in the first place.