I realize that their first push is to have enough stuff for people in general (discounting the small portion of players who play 8 hours a day) that they can justify charging a monthly fee.
I believe that more content will be added later to cater to more "hardcore" players, and that SE is willing to sacrifice them for the time being because they need something profitable more than they need a few rabid gamers.
People ragequit MMOs all the time and say they'll never go back. Many of those people do go back. So realistically, whatever they say aside, SE has a second window to re-capture haijins a few months down the road, provided they implement good content, and provided there's nothing else out that's better than sliced bread (will just have to wait an see).
I was a pretty hardcore FFXI player for a long time, now I'm out of school, married, and working 50+ hour weeks. I still want to be able to attempt challenging content with a small group of good players on my own terms, but I don't want to have to schedule my life around when I can do things in a game. So the more they make it hard to get the phattest loot by requiring more strategy, teamwork, coordination, and competence, rather than via long lockouts, awful droprates, or the need to zerg with numbers, the better.