I can't site the source, because I learned of it in a conversation some years ago with someone who was writing about the American arts in the 1960s rather than my own reading, but there were studies in the late 1950s that predicted a rosy future for the arts, because of the GI Bill and the liberal arts education they were receiving. Union victories had given the "working class," as it was then called, more leisure time, and this time would be spent on ... the arts. The frame of reference for these deductions were the same as Brooks cites describes -- that the middle class was always striving to better itself, to learn about high arts and culture -- going back to the New England Lyceum movement -- and that the culture changed. Now, that model would be considered paternalistic, by both the left and the right, I think, but for different reasons.
Editing, because I forgot, as I often do, to tie my point to the discussion



