Challenge: Name the Year after Edmund Wilson's Death when "N Y Intellectuals" became "Intellectuals without Information"

I look at reviews of my biography from Paul Berman and James Wood to Brenda Wineapple and Richard H. Brodhead and Andrew Delbanco and wonder if there is a date we can all agree on when the cadre of New York reviewers of biographies became reviewers without information and would-be intellectuals without information--and also when the cadre of N Y biographers became biographers without information or without the ability to convey information intelligently. There has to be a turning point? or am I glamorizing the old days?