I suspect the textbook market is too fractured and polluted by competing views on teaching and political agendas for that to do much good.  Everybody writes textbooks these days, because that's where the money is, and obviously professors are going to want their students to buy their textbooks.

I'm sure it's always been that way to some extent, but it used to be that Samuelson's textbook was quite common.

Although Krugman's intro texts are gaining some steam, as I understand it.

Be nice to America. Or we'll bring democracy to your country.