I used to think that was an issue... until I became a geographer. Suburban land is miniscule compared to the vast areas required for agriculture. There is no impact except on a very small local scale.
The percentage of America that is suburban AND urban land use is only about 2.6%.
http://www.ers.usda.gov/Publications/EIB14/
The United States has a total land area of nearly 2.3 billion acres. Major uses in 2002 were forest-use land, 651 million acres (28.8 percent); grassland pasture and range land, 587 million acres (25.9 percent); cropland, 442 million acres (19.5 percent); special uses (primarily parks and wildlife areas), 297 million acres (13.1 percent); miscellaneous other uses, 228 million acres (10.1 percent); and urban land, 60 million acres (2.6 percent).
That won't be be relevant when we have electric cars running on free wind and solar power. It's barely relevant now-- the distances you drive are miniscule.
The real problem is people commuting to cities to work, and that is nullified when businesses locate in those exurbs. I did contract work at the oil company Anadarko. Their office is in The Woodlands, and a lot of the employees live very close by. There's no real tradeoff but they benefit from better standard of living, lower taxes, cheaper land, and no risk of urban decay.
Telecommuting is the way of the future.
Not really. When I was fixing the soft top on my Miata I took it for a test drive in Magnolia, TX. I found a band playing in a little industrial structure, probably a machinist or mechanic shop. There are bars and restaurants in suburban areas too, and not just Applebees... Whether you like them or you like house music clubs is personal preference.
Where is the nature in Brooklyn? New Urbanist suburban developments tend to have parks and nature reserves. Everywhere that has people has culture... You seem to be making a value judgment that one type of culture is better than another.