Avatar was in the 80% when it came out. Still in the 80%...
AOU was also getting less than stellar % when it came out.
I am talking more about public opinion.... The ratings on RT will stay basically the same unless a bunch of critics hold out on doing their review much later... Once a review is up it's up... The passage of time does not change the written review even though the person who wrote i might feel differently about the film.