Isn't there more now than at 2.0's endgame? That was 1 raid (Coil) and 2 tome dungeons (WP and AK) IIRC. Now there's those (Fractal, Neverreap, Alex normal), supplemented with hunts and an extra raid (Alex savage).
Well you had the relic run, but really the big difference is...
The game was new back then and people didn't mind re-running the same content. But we've had 5 major patches and 1 expansion since, and the current content system (1 casual raid (ct, alex nm) + 1 hardcore raid (coil, savage) + a primal or two which is invalidated after a couple farms + a couple dungeons to run for currency) hasn't changed and is really tiring people out on the game.
They really need to create new systems that provide a lot more endgame content. I don't think most people would have issues with them re-using content like CT, Coil, etc. The issue is they have created a gear system that creates no reason to run other content. That's the core of the issue. Until they add more secondary stats for gear variety / choices which allows more than 2 gear sets at the same iLevel (or similar iLevel), then they cannot design anything but raid + currency + maybe a primal fight content.
Another key is to make drops harder to come by for everything, not just raids. You then lock out the content after a clear. So say you do Ravana EX and clear it, one or two people get their weapon and you can try again in a week. Do that for all content and it extends it's life. But the issue with this is it requires a static / party with friends environment and a lot of people play this like an offline RPG then an MMO.