He's always been talking about other projects and the idea isn't really new. I think it won't matter that much for now and we'll have a lot more time for SS until it's done as he imagines the game to be. On the other hand I'm pretty sure we won't see that many additions afterwards and that he will move on once everything makes sense. Which means side characters will stay side characters and we won't see endless additions to finished storylines. So I'd think that mom's story is finshed now (except what's needed for the main plot and other characters) and that we'll see the last big updates for Diane and Jenny soon too.
He's already stated during streams that no ones story is finished. There's alot more content to be added for characters that have already had updates, including the mom.
Well, I clearly didn't say that her story is completly finished but that I don't expect her to get a full update, especially since - as far as I'm aware - he has never even mentioned another mum update since. And I'm sure the same will be true for Jenny and Diane after they've got their updates. Obviously she still needs additional content when Diane moves in and to complete the story (Prom etc.) and maybe some other small stuff but I'd actually guess that is going to be it - especially given the fact that he wants to move on at some point.
I'm pretty sure he has said there will be more updates for her, but further down the line. He said he wants to get through a majority of the other characters first.
In my opinion it's likely a matter of time. Of course I don't know what he has planned but if he's looking already now for somebody to start working on the next game we are likely talking about maybe another 2(?) years he wants to invest in SS (which is already way, way too little given what actually needs to be done) and I can't really see him adding that much more afterwards to for example mom, the teachers, etc. if he doesn't want to spend another 2 years after that.
Well, DC had a stable, normal job in the gaming industry for almost a decade before he started with SS. I'm sure his next game will be an H game as well so I doubt he wants to leave us anytime soon. Surely he wants to grow his business but at the moment he's one of the best H game producers in the "western world" and I'm sure there's quite a bit of money in that in future.
