That's already modeled, both in the exponentially increasing food requirements for growth (growing from 10 to 11 is much harder than 1 to 2, for nearly the same

That's already modeled, both in the exponentially increasing food requirements for growth (growing from 10 to 11 is much harder than 1 to 2, for nearly the same benefit), as well as the housing cap and amenities mechanics in the latest iteration of the game.