Edible landscapes are pretty common in my neighborhood, especially fruit trees.

Boulder CO is a remarkable place, but ultimately unrepresentative of the typical US suburban lifestyle. My edible landscape is likely in the category of far-less-than-1% of the yards here in Virginia.

Three factors are going to make it difficult to stay in Suburbia;

1. Subprime mortgages start many recent homeowners off with a major handicap, with too many people simply walking away from their homes; abandoned homes will become hideouts for transients and looters
2. Travel distance, especially for exurban. Biking, carpooling, vanpooling, and bus networks could make suburbia transportation possible, if enough people do that instead of clinging to the one-occupant auto commute.
3. 1/4 acre yards don't support a great deal of food production, especially with a house, garage, driveway taking up a goodly portion of that. If exurban 1-3 acres yards are counted, then they could have the potential to provide a substantial amount of food for the occupants, if the occupants decide to 'farm'.

Will,

To remain in suburbs most people will have to abandon the daily trips to the mall and learn to make do with what they have on hand. An average suburban lot may have anywhere from 3000 to 8000 sq. ft. of usable land that could have the majority of lawn removed and brought to plantable condition with little work.

Available fertilizers and water could be supplemented using grey water and human excrement properly composted. Getting people past the idea of using their own waste to feed their crops will be hard to accomplish but hunger is a powerful motivator. Improper composting of human waste may create to many disease outbreaks and have to be outlawed in order to prevent spread of chollera or other pathogens. Sewer treatment plants could begin composting their sludge similar to that of Milwaukee and their "Milorganite" product. Distribution on an as needed basis from the processing facility could supplement the available fertilizers to the area residents.

A typical lot if managed correctly could go a long ways to providing food sources to many of the suburban populations which could free up resources to be used for the inner cities.

I believe many layers of production will be necessary in order to prevent famine from becoming a part of our daily living.

In order to begin the move to sustainable communities many landscape firms could be selling these garden packages to residents beginning now. It is not too early to begin the shift to this and would be a great idea for some politician to seize upon as a "Return to Victory Garden" movement.

What better way to involve the general population in understanding our energy problems?

I hope we begin soon.

An average suburban lot may have anywhere from 3000 to 8000 sq. ft. of usable land that could have the majority of lawn removed and brought to plantable condition with little work.

Have you actually tried this? I've converted quite a bit of my lawn to garden, edible landscaping, and small grains, and it would not be correct to say it took "little work".

Most people will cling to their concept of how a suburban lawn should look, afraid of what the neighbors might think.
I'm all for the return to Victory Gardens, meanwhile Joe Sixpack rides around on his 28hp riding lawnmower and relaxes watching NASCAR truck races. Changing the mindset will be the toughest challenge, especially with climate change denialists and the Yergins of the world telling the Joe Sixpacks that they are on the right track, no worries.