Regarding moving out, it depends on if it will be a part of the game, or just told in the epilogue. If the game starts to wrap everything up, it wouldn't make much sense to to have all the possible moving ins and -outs, just for the game to end one or two chapters later. If however the game has a lenghty second or third act elaborating on Ian and Lena and how they deal on their new various career paths, then they will be included, just like Ahsleys different options in GGGB.
Ian can be thrown out if he is on bad terms with Perry, especially if he and Cindy are found out. Possible even if he gets together with Emma, Perry may be petty enough. In the Cindy case, Wade could even move in, he and Ian could just switching places.
Else, Ian is likely tired of Perry and moves in with whoever will be his girlfriend, who is also moving out and looking for a place: Lena, Holly, Alison, Emma, Cherry, Jessica, Louise. Cindy may be satisfied with her place and Minerva likely stays, since she still has a husband and son (pretty sick if Ian moves to her).
Loser Ian may just stay with Perry.
The Lena Stan Louise flat is at the knifes edge, all three have issues with each other and two of them suffer under the rent. The girls could abandon Stan who just stays and gets whoever as new roommates. Lena moves to one of her million boyfriends, Louise leaves if neither Ian or Lena paid attention to her. If Stan is bullied by them, he may leave or have a breakdown and get himself arrested or killed, so one space is open, an option could be Holly.
