It's not so much brain washing (though that, or some low grade version does go on) as it is vigorous self-selection and an even more vigorous discouragement of dissenters from even trying to enter the field. And, yes, I am aware that certain war horse professors, when they get older, tend to get a little unorthodox. They are eminent enough that they can get away with it. But from what I can see, this has no effect whatsoever on the mainstream of their discipline and no effect at all on their institutions. All the lower-down people are less smart and have more to lose. They stay on message. Also, these schools are by now 50% admin or more, and in my experience "staff" is more ideologically pure and full of zeal than faculty. Also, funny that you mention Fish. Yeah, I appreciate to some small degree the extent to which he has become a bit iconoclastic, not to say moved right. But I can't forget the much larger extent to which he was an absolute Titan and Dynamo and Vanguard of the effort to radicalize and politicize literature throughout the 1980s and beyond. Thing is, 90% of the MLA types revere and follow the old Fish (some without even realizing it) and most don't even know that he has changed a little. Many of those who do know think the changes amount to selling out and they resent him for it and still much prefer the old Fish.