I don't know why a lot of people are taking this as an insult to the mother. I just see it as if she was the right person for Ted to settle down and start a family, and Robin was simply someone who has always shared a strong bond with him. They care for each other, so why not get together at a moment they are both available? I mean, this whole 'love of his life' is a too restrictive concept. Robin would've probably made Ted unhappy if she had chosen him instead of Barney. She would have had the same distant life, always focused on her work, that she had with Barney which was the complete opposite of what Ted wanted. I also think the portrayal of the mother makes sense considering it's the tale a father is telling to his kids...he presents her as the most perfect person in the world, while also stating that their 'aunt Robin' is a very special person for him too. And even though she was obviously not the right woman for him a those various stages of his life, maybe now it would be the right moment for them. He is saying how special Robin is for him, while trying to be completely respectful to the mother as well. This also proves the point that no finale is ever going to please everyone: people were angry when Barney got together with Robin because it didn't fit his personality and they are angry now because he stayed true to his nature; And they also get angry when writers make the ending of some shows along the road, but also now when they have stayed true to the one they envisioned from the very beginning (the scene with the kids was recorded during season 2). I just think the story makes sense, and it has made one hell of a funny sitcom. I will miss the show.