Sorry to pull a little thread necromancy here...
This thread has been around for a few years and it was intended to be an ongoing discussion.
It will NEVER be Robin.
Despite what Marshall did in saying "Not Yet" to Lily.
They could go a different Route and have the mother be named "ROBIN" too I guess.
That twist at the end was pretty bizarre. They wouldn't have put it there unless it meant something. Having the mother also be named Robin makes the most sense. I don't see how they could twist things to make our Robin the mother.
So, who is Barney ending up with? We know it ends with a wedding. Does he get back with Nora or is it Robin?
For a while now I've been thinking that Nora will be back. Now I'm not so sure. They've done a good job of shaking things up again.