No, there's plenty of content in the next update.
The main issue with the game is that the early game is too slow. Communication/Concentration/Demonstration all get the gameplay speed up to acceptable levels but they take so long to get.
This game has a bizarre reverse difficulty curve. Everything is much harder to do in early game when there is much less reward (porno scenes). By the time you get into the good content you are usually quite a bit quicker at changing ATs due to exp gains being 3-5x higher and also being much more efficient at farming the required conversation topics.
I brought it up in my review of this game I posted in this thread, and the dev said that was due to your family members being hard content you are supposed to tackle later in the game, and that there would be easier to advance characters outside the home added in later that you can work on first to gain skills/exp for your main character. He was just doing that at-home characters first because the home is where the player spends a lot of time, although I suspect it is actually because incest content is popular among many porn game connoisseurs.
I don't think that is going to happen though, even if that was the initial plan. It has already been several years and there is very little non-family character content. And access to most of them is tied to advancing through family member ATs and they have very harsh schedule limits on when you can interact with them.
I think it'd be much better to make the initial ATs for all characters much quicker to advance through, and maybe add in additional challenges/difficulty for later ATs to get a better and more satisfying easier-to-harder difficulty curve for the game.