This is an incest game. I don't see the purpose of going back to a non-family character in a long-dead branch of the story, especially if it's going to take time away from what's already going on. Yes, people voted more Olivia content on that poll. They also voted for Max to leave the house, and look how great that went. That poll is also a few updates old. If you straight-up asked people to choose between more Olivia content, or sex with Ann or Lisa, I suspect most would go for the second option. Back then, I think most people assumed we'd have had sex with both of them by now.
Here's my prediction for if more Olivia content is added: the people that don't care for Olivia will hate it, and the people that do like Olivia will be underwhelmed, just as this last update underwhelmed those who asked for the Lisa romance option and to leave the house. People have built up things like leaving the house, dating Lisa, or having Olivia back in their minds so much that people are going to be disappointed no matter what. Honestly, I expect to be disappointed when sex with Ann and Lisa actually happens. But at least it will have happened finally. Then maybe DS can stop working on the game he clearly doesn't like, and that would be the ultimate end to all of the Eric/Olivia/whatever arguments with the game. It's time for the blueballing and milking with this game to draw to an end. It just wasn't written with enough depth to drag on this long.
I fully agree that Vicky was bullshit. But the fact that he didn't bring Olivia in is telling, or that she isn't even mentioned in the poll. Either he doesn't want to write more about her, or he doesn't think he can work her back into the game. Option 3 is that he plans on making 1.0 all about her, which is why she isn't mentioned. I wouldn't be surprised if that was the case, because it fits into his entire throwing delays into the incest stuff. I know you really like Olivia, but if 1.0 comes out and it's all about Olivia, and little or nothing progresses with Ann or Lisa, how do you think people will react?