I haven't found all meats to be prohibitively expensive.
First off, the guy in the article cites the cost of premium cuts like NY Strip. Well durr, of course it's going to be costly! When was it ever cheap? Although I find that certain cuts that used to be cheap have risen slightly, and others, like lamb, have gone up enough that I don't buy it as often. Chicken is still inexpensive, organic livers are still $2/lb, and ground beef generally costs about the same. I'd say that my average weekly grocery costs are split 50/50 between meat and produce. Plus, I still have to buy non-food items like calcium supps, toothpaste, deodorant, facial lotion, hair stuff, etc about once a month. Since eating Paleo I've been more careful to plan my shopping, instead of just buying dinner on a whim every night. Although with all the rain we've been having here in FL, I did pick up some sushi last night for dinner (since going outside is like being underwater), along with a box of dates. Made for a tasty din-din, lol.
Perhaps cost depends upon which area of the country you live in? When you've only got Walmart Supercenter or Whole Foods to shop at, that doesn't leave you with very many options. And Walmart doesn't have great prices like they used to, so where does that leave shoppers? Butchers are few and far between (especially in suburban/metro areas), and meats come with the fat all trimmed off so stores can jack up the price.
I hope more people go vegetarian, that means more meat for me :D When there's a shortage in grains & beans due to droughts or natural disasters, don't come crying to me about it.