I think I'll be in it for the long haul. I for one am very satisfied with the current content and new content is pretty regular, (and at no extra cost, which is great, no pesky expansion costs!).
Compared to other MMO's I've played, ZOS jump onto bug fixes pretty swiftly, I think most if not all of the bugs I encounted during the early levels have been fixed now.
However even though I'm content, I think alot of players expected a more 'fleshed out' game, as alot of people have come from other MMO's that have been chucking out content for years, so I guess ESO feels a little limited to them. However ESO has the potential to be absolutely fantastic, and I think, at the current rate of content release, it's well on the way to becoming so, and I'm excited for the future. ^_^
I look at the totality of Elder Scrolls Online, its gameplay, the perceived rate of released updates, the lore and how well it lends itself to roleplay, and I see nothing but potential. Part of me is glad people who have moved on already are gone, because I would rather see this game's community develop with a small and dedicated core than see people set up pillars and then vanish.