Sagging sales of cell phones have made manufacturers desperate for new features. Cellular ones aren't likely to either, at least after the early adopters move on to the next high-tech beanie baby. Maybe the cell phone camera could scan for brain damage. A recession would make that boomerang. Most city dwellers live only a short distance from stores that sell videos, food, and sundries.
Home delivery is a highly discretionary expense.
The notion that in a recession small luxuries are substituted for larger ones goes only so far. People cut back where it's easiest, and substitutions aren't linear. People may treat themselves to a luxury clothing item in lieu of a European vacation. But home delivery of a video and Twinkies isn't a psychic substitute for a night on the town. All sorts of delivery services suffer in economic downturns.