A fairly large chunk of the border areas around my lawn are left wild with trees and tall grasses and etc. But otherwise I have kids and such a while they love to climb through the wild areas, they also love playing on the open lawn too.... I'm not ready to take that from them even if it was feasible. If I were in the southwest where lawns were more or less optional then yeah, but not where I am now.
There are more sustainable ways to live, we just have to be open to discussing them. You want a lawn - how often do your children play on it? An hour per day? That means your lawn is unused 96% of the time.
How about we redesign our living spaces so we have one large common lawn that many residences can share. Kids will be more encouraged to play outside and play together. And we can put markets within walking distance of these residences, and movie theaters and other stores.
Suddenly our children are more social, we're getting more exercise, driving less, not having insect-killing monospecies lawns that aren't used 96% of the time and many other benefits.
There are solutions to this but if we put our fingers in our ears and say we want things how they've been for the last 60 years then we are no smarter than the cyanobacteria that converted so much carbon dioxide to oxygen that they suffocated themselves 2.5 billion years ago.