Just want to add that I too believe that paying for things on credit and through debt cannot continue endlessly. I was Christmas shopping (where I live in Canada) in a very busy department store. When I paid the clerk in cash (I use cash because then I know I have the money.....) he looked kind of surprised. He said that he had been on the register for three hours, and I was only the second customer who paid in cash. Now I am told that many Canadians use debit cards, but still! That's pretty crazy!
Actually, I think most folks use debit cards instead of cash now anyway. I work at CVS and I would estimate that probably only a quarter of the customers who come through my line actually use cash, and most of them are only using it for purchases of like one or two items for less than $1. Probably only 1 person a shift writes a check, the rest is all plastic. However, most of the plastic is debit cards rather than credit cards. DH and I no longer own a credit card, but we almost never have cash.