I thought it was obvious for a while now that Barney and Robin weren't going to work long-term. I actually thought his transformation when he held his daughter wasn't something instant. He had grown over the years, and reverted back to his old behavior as his way of handling his grief over the end of his marriage to Robin. But that growth was still there. I'm not really sure Ted and Robin work, but considering that they're now 50 something and all of their priorities and goals have changed, I can buy it. The least believable part, IMO, was that Robin, a gorgeous world-famous news anchor, was that miserable for ten years. But I guess we only saw glimpses of her over that time, and always when she was in a very nostalgic mood because she was seeing her old friends/husband/lovers. Also, Lily seemed sad and very unable to let go of her youth, and I don't know what happened to the career that meant so much to her.