There was an article when this movie came out, maybe several articles, about how it inverts the "pro-life" theme (save the unborn) of the earlier movies into a "pro-abortion" theme (kill it before it's born). It also inverts the "figuring out our predetermined role" theme of the earlier films into a "radical freedom" theme. But most interesting to me is the extent to which this movie acts as a kind of apologia for arranged marriage. Isn't that kind of weird? Arnold refers to Sarah as "his Sarah", and raises her telling her about her betrothed. The betrothed appears, and has to keep her safe and prove his worth. In the end, she consents to the arranged match, and is both bound and free at the same time.
Perhaps I'm deceiving myself, but once again one of the striking things about this movie (like Terminator: Salvation, which I enjoyed greatly), is the way its characters seem suffused with a kind of honestas. Sure, they've got attitude and they're not always well-spoken, but what do they want above all? To give themselves up for the life of the world. And what do they value in their own lives? The trust and friendship of their elders. So, my takeaway from Genisys?
It's a glorification of filial piety and arranged marriage.