This has been discussed so often here, I don't wanna go into it again. It's usually not as easy as it sounds, especially not if you want it to stay as creative and consistent as it gets. You either have to go really big by employing literally a whole team of artists or you may leave it as it is, unless you find the perfect guy to share the whole project with. The first doesn't seem to be an option and as such it looks like DC will continue to draw on his own. Given that he's doing nothing but drawing, we get excactly what he's able to draw in any given timeframe. To me that's fair.
Well, he's still delivering the content. Just that there's more of it now. I personally don't really see any value in finishing a game just for the sake of it. Sure, there are games which overstayed their welcome, but quite often a bit more would have been nice. In SS' case there's a lot more content needed before the game will feel finished and as such he may continue to work on it. It would be a shame if he'd rush it to some kind of ending, as he seems to have considered it in 2017 and I'm happy he didn't do it.
In the end the development circles are more or less as they are since 2018 and one may assume that those who are giving him money right now, should know what they are doing.