It think it will be easier in the approach that significantly more guilds will down the content quicker than they did before, even if it's purely by nature of people able to preemptively min/max the expansion.
One thing I think though is we're going to see a bigger divide/gap in the casual/hardcore group because of the increased effort it will take to clear the content since we specifically now have the difficulty separations within the raid. Most of the 'dad guilds' are going to be fine settling for normal difficulty kills to feed the nostalgia trip and there's nothing wrong with that whereas right now you have a hefty chunk of guilds/groups who pushed themselves to a breaking point to try and clear Naxx.