Whilst I don't think anyone is suggesting total self sufficiency on a window ledge or similar it would be a good idea Varian to check out verticalveg.org.UK and similar blogs. You would be absolutely amazed at what can be achieved as I said in an earlier post on this thread.
From all that is written it would appear to be more likely that the world debt culture and the subsequent world financial collapse will eventually be what has the negative impact on the ability of people to feed themselves rather than any of the spurious suggestions on here. We may not be able to eat as once we could but people will eat what is available - just like we used to do in times past and as they do in so many other countries in this world. Always a good idea to learn how to look after yourself anyway.
As for the unwillingness of people to do manual work it is amazing what people can do when necessary, they just need the motivation. "Needs must when the devil drives" OR "sometimes events compel you to do what you would rather not". Handwringers starve!