I don't think the OP is suggesting a plastic-less society. The points simply lay out the reasons to keep cash on the table as a viable option.
Yes, that's why I started my comment with, I think that cash should always be an option.
Whether impoverished or living on cash by choice (it's actually something I recommend when counseling people on budgeting - there's a whole system) - some people CANNOT live in a plastic world.
I couldn't agree more, if yo cannot spend responsibly with plastic, cut the card up RIGHT NOW. Otherwise, get yourself a rewards card that maximizes points in the areas where you spend, fuel, travel, groceries etc and rack yourself up some points and USE THEM. Otherwise, dirkson is right that most businesses factor in the cost of processing credit in to their pricing structure and your paying for someones rewards points. -They might as well be yours.