That sort of answered the question...Please don't take what I say next as criticism. As I've said before, these are just my opinions and the facts as I know them, and I apologize if they offend or if the facts are incorrect. I'm more knowledgable of the third edition rules for wizards and familiars.
Stop me if I'm wrong, but the way I understand your post is that:
Sola should get a familiar because he's a wizard, and all wizards need one.
Also, he should get a familiar because he's building a new life.
Your first point is incorrect. Some wizards choose not to take the risk of a familiar, knowing that familiars are a big responsibility, that you are stuck with whatever you get, and that there are incredible repercussions if the familiar or the wizard dies. Some wizards also dislike the sensation of having something so intimately connected to them; a familiar is privy to many of the wizards thoughts and feelings.
Sola is fresh from the Underdark, a place where trust is foolish and you have to believe everyone will betray you. Even if a familiar can't exactly betray you, the sheer amounts of information a familiar could provide to your enemies if it was so inclined are astonishing. Sola may not feel ready to risk that.
He is also, as someone pointed out earlier, a fairly solitary man. He is used to being alone. At this stage in his life, I don't believe he really wants a familiar. He is still attempting to sort out who he is and what his life is now going to be like. He seems unprepared to *also* handle a bond with a familiar, and the thoughts and emotions of the familiar.
As for your second point...Sola says in one of his lovetalks (the one about having children) "I have not been particularly adept at safeguarding my loved ones." I'm unclear if the familiar was planned to be a romance-only feature, but that was my understanding. If so, he is already risking himself enough by allowing himself to love the PC, and in one case, a child. I'm not sure if he would want to add a familiar to the list of things he loves and is therefore risking.
But as I've said, this is Wes's call.