You know, these types of questions always piss me off... I've been an open source contributor for a number of decades - and there's always someone that seems to present the question of "Is it dead?" with no idea of the amount of effort that goes on behind the scenes.
I'm very thankful for the work that @foosel does - and I try to give my feedback on the betas as they come up - because although I haven't contributed to OctoPrint, it makes my life so much easier.
I have however had the nights of getting to bed a few hours before the morning alarm goes off because I'm just stuck on a problem that I want to get fixed. And this is in projects that I don't receive any income for.
So many people think there's a company and paid developers around all this stuff - and in reality, its just a tiny group of dedicated people that change the world. In reality, if you want something to change - make it happen and contribute yourself. Patches and features are always appreciated in open source. If you just want to complain, then you won't really find anyone willing to lend an ear.
To @foosel and co, keep up the good work, and thank you for making my life easier and freeing up my own time so I can contribute my own little part in improving the world.