Definitely not a regular, but as someone who has been a fan of multiple other games which have gone through this cycle I think that it is very likely that SOME work has been done, and that at some point an update will be released. Granted, I don't expect it to be very inspired, or well thought out.
For the most infamous example, milfy city has been dead or abandoned for a year+ how many times now?
The first week of this game was really top tier among all VNs on this site. Every scene was acted out by the characters, there was always dialog and story that had good flow and consistency. I think if you've never tried to tell a story like this its easy to not truly appreciate how hard it is to make a story with dialogue that flows nicely like this. However, I noticed from mid-week two onwards a general lack of inspiration. He started committing the sin of "Telling not showing" where it seemed like every second scene I was being told about something happening with a black screen to look at. The dialog got repetitive, the story elements were pushed to the wayside in favor of a treadmill of characters that you could never possibly make narrative arcs for. For example, you build up connections and stories with Kaede and Aki, and by far we spend more time in throwaway sex scenes with Satsune, or with random schoolgirl #45 who has no story relevance other than giving blowjobs in a public bathroom.
That being said, keeping up the kind of motivation that something like the first week of this VN would have taken, in my mind generally is very rare or nearly impossible.
That is sort of the key to all of these really good VNs. They start as genuine passion projects that are often just the escapism or fantasies of the writer/creator being put on the screen. I think it is more of a case that the money being so good is what keeps them around at all. At a certain point, whether from burnout or simple loss of passion for a project the creator doesn't actually want to do it anymore. Often times, however, the money is just too good to walk away from.
The honest thing would be to be up-front about this, and freeze payments until you want to continue working on the game, or pull the plug and delete the patreon altogether. Or hell, just give permission to someone else to continue making the game (if that person exists). But with the amount of money on the line, I think it becomes very easy to lie to yourself that its okay to keep the page open and that your few hours of work a week justifies it. That someday you'll be back to regular updates, that it's just a rough patch.
BUT TLDR; There's basically a 0% chance a game recovers from such a huge loss of momentum. Even if we get more content it will never be the Ecchi Sensei you or I remember after downloading when this first released.