I think you're spot on about Robin knocking on Ted's door. It's the way I've pictured it ever since Ted came back to Robin in Season 7—the story begins with Robin because the story has to end with Robin. Victoria said the same thing: Robin holds him back. He will have finally let go of her if he's the one to turn her…

Yes! I love the occasional breaking-the-fourth-wall in this show. It seems like something they didn't really get into until Season 7 or so, but it's great for moments like that.

I really don't see why a long-running sitcom would have such a needlessly depressing twist.

But we already know that they're both rethinking their engagement at the wedding.