I'm not sure what you are experiencing, but I just returned to Hubski after an absence and it does not seem to have significantly changed. It's still one of the best places for intelligent conversation in a spirit of kindness that I have come across on the web.
However, in all honesty, I am not at a point where I can simply let things be as they are, and keep the will to see that the bugs are fixed, the https certificates are renewed, and the bills are paid.
If it's never going to be a money maker, have you considered handing it off to someone else or open-sourcing it so a site with the same dynamic could be hosted elsewhere? It would be a shame to see you just shut it down.
If what we will have is what we do have, then I think I honestly am. There's plenty of places that accomplish that already.
I am not aware of other sites that facilitate mostly intelligent and respectful discussion like Hubski does. I have always thought the site mechanics are largely responsible for that. In all my years of wandering the internet, Hubski stands out as one of the few best places. I get that it's not free to run, but don't underestimate what you have here, and know that some of us would be quite sad to see it go.