Well I'd say that arguably the best film I've seen the past year (for the first time) was Michael Haneke's 71 Fragments a film which I certainly intend to include on my next list, but I don't even remember the last time I saw a new film and thought "this is top 100 good". Its as if I only watch new films to judge them as candidates for a year end list, perhaps leaving out their place in the general film lexicon. 

I'd say the greatest reason might be age. When I was 16 or 17 watching movies was almost a way to figure out what would go in a top 100. Once I had a pretty decent list it then became harder and harder to let new entries in (similar to America's immigration policy I suppose). So I'd like to revisit a lot of the films I initially was impressed enough to put on a list and see if they still belong. If I ever finish this update and you see a host of films from 2002 onward then assume I worked out my block.