The elvish situation is a huge part of the overarching story, but it is only one way the world oppresses people like those in the hotel. You're right that the characters are coming together, but all of these topics have been in the game since the very beginning, in the background. Lin is the very first main character you meet and she explains the situation and her fears.
Wholesome and or relaxing events away from the action are still things I plan on doing, but I won't be going over the same topics over and over again, and a lot of the character's personal issues have been resolved. Ashley is friends with the clones for example.
A semi serious story is what I'm already doing, so I'm glad most are happy with what I'm already doing. If memory serves, the second most voted on option was an even more serious story. But Harem Hotel has a decent amount of stretching you need to do for things to make sense. For example, MC never takes his clothes off. There are no stairs down in the first or second floor, and MC's room is lost in limbo. I also don't want to directly show super serious things, like self harm, rape, murder etc. Those things can be unseen or just heard of because there's a line I don't want to cross.
I take it you mean you want an even less serious story, one without any world issues that are addressed. Well, that's not Harem Hotel. Again, from day 1 you are introduced to the slavery issue through Lin, and the monopolistic greed issue through Kali. Then poverty with Ashley, and objectification with Maria. So I think it's safe to say you can expect these topics to be expanded upon and dealt with. The MC is a supportive person, one who helps his family with any personal issue they have. But he alone doesn't have the power to change the world that hates them.
But I would like to reiterate like I try to do in most situations like this, Harem Hotel is not only about the overarching story and will not always cover serious topics. There will be lighthearted moments, as this is still a dating sim. For example, in v0.13 I plan for Lin to have a well deserved lighthearted break after her win in v0.12. Something that focuses on the two of you.