The trick would be getting people to have and grow their own edible lawns. Then the cost is the same as keeping the lawns of today, but there's a more useful return.
It's only a values issue. In Russia for example small gardeners produce 40% of the nations food.
http://naturalhomes.org/naturalliving/russian-dacha.htm
And perhaps the evolution of tools like https://farmbot.io/ An intelligent 'lawmmower' makes your permaculture for you.
Re:A Farm Grows in the City
by randomdata on Tuesday May 16, 2017 @03:35PM
(#14352547)
> Then the cost is the same as keeping the lawns of today
By far, the biggest cost of my lawn is the 5 minutes per week I have to spend cutting it. How does an edible lawn compete with that?
It is the same thing as we could assemble cars in almost any workshop or hangar, but we build cars at scale in only a few places.