Funny, because when roch/drags was end game, the game population was far higher than it is now even though level 60 gear was easy to obtain and roch/drags werent hard.
The game pop took a nose dive when s2 was released. Why? s2 was too hard, drag mats werent in seal shop yet, and most people got their level 80 gear by buying boxes. As people kept doing s2 raids and getting burnt out, more and more quit because "why bother, i wont get drops anyway". When level 80 mats were put into the seal shop, I was actually able to convince some of them to come back because they could use seals to progress their gear.
Everytime the game has gotten easier by improving the seal shop, the game pop has actually risen because people tried coming back. Everytime the game has gotten harder, people have responded by giving up and playing other games instead.
Look at all the relatively hard parts of the game. Neam obviously comes to mind. When Neam came out, I predicted that most people would give up and stop trying after a month or so. Turns out I was right. When Neam first came out, I saw several Neam practice parties evey single day. After a month, that dropped to zero. And the number of parties that actually do successful runs now is 1, and they usually dont even have a full party. (Figures for your server will differ obviously).
Look at the revamped royal raids. They used to be super easy, and people sometimes did them for titles/easy seals whenever people megaphoned for it. Now, people dont touch them because the bosses have insanely high HP and it takes 20+ minutes to kill for terrible rewards, and thats with at least 6 very well geared players carrying. And thats assuming the servers dont turn into a slideshow. If the servers do turn into a slide show, enjoy your 30+ minutes of boredom.
There are still people in full level 90 OJ enchanted gear who refuse to touch Nifleheim because "too hard" or "ceebs". That should tell you all you need to know about how much the population likes difficult things. I have seen people with +15 level 90s refuse to do s3 dailies because "it is too hard". That says a lot.
For every hardcore player who wants something to be difficult, there are probably at least 10 who wants it easier. How many people have you seen quit the game because "this is too hard" vs "this too easy"? Pretty much every veteran has lost count of the number of people who have quit because they couldnt progress in gear, couldnt get drops, couldnt even get to +8 after using 10 runes, etc, etc. I can only remember two guys who quit because they complained it was too easy...ironically they are now playing again, and aren't enjoying Neam.
Oh sure you hear about people quitting because they got good gear and feel they have nothing else to aim for. What they dont tell you is that they still can improve their gear, but cant be bothered to do so. Most of those are attack capped for s3, but arent stat capped, and dont want to try. Why? "Ceebs". Sure they can use material synthesis to stat cap...but again..."ceebs". When it takes more than a week's worth of s3 dailies to get enough mats for one major stat increase, most people simply cannot be bothered.
I find myself repeating the same conversation everytime a new piece of gear is released. When Eoch earrings came out, I had people tell me they didnt want to play because they had good gear and felt there was nothning left to do, even though they didnt have the new earrings. When I asked them why they didnt want to get the new earrings, they just said "ceebs" "i wont get the rare drop anyway" "too hard". Same thing happened with the level 85 belt. Its not that they have nothing left to do, its that they have nothing EASY left to do.
They could run Eochaid/Abomination to get the essence...but because its REALLY rare....they cant be bothered. Where are they now? Playing other games. When/If we get eoch/abo essences in the seal shop, they will probably come back to make it with seals. But they wont touch the raids because they cant be bothered to do them, and in the meantime they wont play the game because they ran out of easy stuff to do.