Well, they could constantly change the number of nominees each year depending on the crop like how they do for BP nowadays (I mean, they didn't think much of having only four BAF nominees last year, which entailed shutting out MU entirely).
If they can reduce the nominee number based on quality, shouldn't the inverse be true as well i.e. increase the number if there are more quality films that deserve to be recognised? I just think it was harsh leaving Tangled out in the cold like that, especially now considering the movie's impact on WDAS's recovery.