Somewhat do and don't agree with that.
On the "do agree" side, I can see that being possible because with Bella, it isn't just that she's married but she's also much older than the MC and also a faculty member so she might be less willing to enter into a serious, committed relationship with him.
With Sage, she does have her troubles letting go of Chad, although she certainly seemed to like the idea of her and the MC being together when he said it in ep 5, but she's also graduating after this year so that could create distance in the relationship if she moves away and she may not be willing to do that.
With Jill, she's been totally smitten with the MC from the very first meeting and there also seems to be a lot less issues that would impede her having a relationship with him aside from her family. But then they could just do the same as his parents and have their relationship in spite of them.
Finally, although Maya and Josy do have their issues, they too seem totally smitten with the MC and he's shown them a lot of care and affection. So it does look like, right now, as though the prospects are good for them on the throuple route even though it would be an unconventional relationship.
However, on the "don't agree" side, they are all main LIs so their chances of ending up with the MC will all be fairly equal despite what I've just said because, although these seem to be the situations with the relationships at this stage, game logic dictates that none of this be taken into account because they are main LIs and so they must all have endings with the MC.