I'm not sure if the producers even think about an endgame couple yet.
Everything is possible. Maybe it'll be none of the both of them
Which would really suck for you Keenler shippers and I don't hope that's not true of course but in this show I learned to take nothing for granted.
I totally agree that the first step to a possible Liz/Ressler start would be her finding out who she really is. And that doesn't mean who her parents are but who she is now.
And we need Ressler to see figuring out if he can be with a person that shot somebody in cold blood, too. There are so many walls between a Ressler/Liz future right now, that both of them have to overcome first.