Problem is if you have the content difficult enough where you get frustrated from the difficulty you have people that will just up and leave for a game that's more relaxing while not being as difficult. MMO's in the past got away with it because that was the only option. They didn't opt for a bigger world because there's not much of a point when people won't spend much time in those areas. Not to mention if it took awhile to get to places people would grow bored and find it tedious running back and forth. People already complained during the leveling up process of the current world and the amount of running around you have to do. The issue is that leveling up/gearing up FF11 wasn't that much of an accomplishment. Killing one mob was no more difficult than killing ten mobs. It's tedious and time consuming aka a grind. Not difficult.
As for the bolded part I enjoyed my time spent in old school mmo's but I refuse to spend time like that again. I'm not alone and if things required that much time I'd play another game that didn't.
