This is something I've worried about a lot, and part of the reason why I dropped off the face of the web for a while in the first place, and why it's been so hard to come back. Depression makes writing difficult, and since I wasn't writing I wasn't updating, and I worried about losing my readers, which made me more depressed and made it harder to write. And because I felt ashamed for leaving stories unfinished, I stopped coming to GA entirely. Judging by the reception of the first thing I've posted in, like, a year and a half, though, it seems people are still interested in reading my stuff. That's a huge relief, and feels really encouraging. Feels like I still have a home.
EDIT: I have, however, decided not to start posting any new chaptered stories until I've finished the first draft from now on. I don't want to end up in that position again.