Crucial to this conversation that is often left out is access. It's not a huge conspiracy of critics, but the fact that many films from "outside the cannon" have gotten widely distributed restorations in the past 15 years. That's significant!
I think it's great that Jeanne Dielman is now well-enough-known to be frequently argued about. It speaks to the ways film culture has changed for the better. Back in my day, film culture was Harvey Weinstein commandeering every art-house cinema to show Mrs. Henderson Presents.