My honest projection for a release date was actually this month, and with zero communication, now I genuinely also am beginning to think it really is abandoned. I had assumed until now MrSL was still actually working on it, and would just release when ready. Missing his projection by even a month or two with no update at all was concerning but not a back breaker for this game. But now missing it by months, and being a year out since the last release, yeah, now it's time to begin thinking there won't actually be another release. Very unfortunate.
This is the rare project I would even think a reboot could make sense. The scenarios option would be a much better way to release things to begin, that would allow completion of stories, and then add the long common route only after all of them are finished. That way it would be easier to tie them together, or even have alternate stories, since the game is designed to be choice driven. The common route would be the "true" route with an actual main story. But probably none of that will happen now.
Even if he never releases a final update, it would be nice to see just a general dialogue from him one last time. He used to communicate with us, and it was to me at least enjoyable. I suppose perhaps it wasn't for him. I hope he's doing well and is happy doing whatever he is now doing.