I think Darkblue is a good storyteller. I doubt he doesn't know about our attachment for Emma. But he said that she's a LI. I doubt he will make it weird. I see in this setup how he will make it unless he make another 30 updates mostly about Emma. And skip some months, years. Charlie and Lucy wouldn't like Emma being with MC at all. Suzy would just chop MC's dick.
I think Darkblue will try something else. Don't know what, but I think Emma's route will be probably most emotional one. I just hope, dev will not force this relationship and make it weird. That would be not good for this game. I thought about MC and Emma in church, Lucy and Charlie stay on the side with strange faces and Suzy running with a gun in MC's direction.
DB has stated many times that he wanted the player to feel the conflict about Emma being an LI. Working as intended I think. Emma has had a few things happen to help her grow up. Zak turned out to be totally opposite of what she dreamed and also her life was threatened. With the previews, we can already see she'll get to meet her favorite fashion designer, so her career may get a jump start, along with the hazards it may bring.
Emma has had no father figure/male role model in her life, so now I think she'll transfer her feelings to the MC. Depending on what path you are on, I have a feeling that you will have to make a choice to accept her feelings or not. If you do want her as LI, how the rest of the family members react may be contingent on how many points you have with them, especially Charlotte.
If not, then you may enjoy a nice fatherly role in her life, depending on what DB has in mind for the end of the story. Who knows, she may end up with David. After all, he adores her.