After nine years, a parade of failed relationships, and hours of Bob Saget's longwinded recollections, How I Met Your Mother is finally approaching its end. On March 31, Ted will meet the still-nameless mother and their life together will begin. But just how long will that life last? We've already considered the likelihood of the mother being dead in the future, but what if she's not the only one to kick the bucket?
After all, there is a lot of evidence pointing toward at least one death in the series finale. It's called "Last Forever," executive producer Carter Bays described the episode as "really heartbreaking," and the fact that Ted's story is so detailed and important to him would make sense. And though this has led many to speculate that the mother is going to die (why else would Ted be relaying this information to his children?), others have theorized that Barney is dead in that future. Which could lead to one we-should-have-seen-it-coming conclusion for the series: Future Ted and future Robin finally get together.
But let's rewind a tad. Why exactly do some fans think Barney will die? Just see one fan's theory, which has made it pretty far on Reddit, listing all of the clues indicating that Barney doesn't make it to hear Ted's story. While a few details are a little farfetched (i.e., Barney always wears suits, an outfit often worn at funerals), others make a lot of sense. So much of what Barney does is extreme and borderline unbelievable. Could a guy really con that many women, then have a sudden transformation into a loving, attentive, thoughtful fiancé? Likely not in real life. But in someone's memory? Of course. If Barney is dead when Ted is telling the story, it's entirely possible that Ted would glorify him, exaggerating all of his stories because he misses his friend and remembers him fondly.
Then there's the way that Ted talks about Barney to his kids, which, as the fan points out, makes it seem like they don't know him well. Just see this example of future-Ted talking about Barney: "The thing you have to understand about your uncle Barney is this... " An odd statement, when you pair it alongside a quote from future-Ted about Marshall, "Kids, something you might not know about your Uncle Marshall is... " Maybe the kids never had the chance to get to know Barney.
Still not convinced Barney might be dead in the future? Let's take a look at Lily's front porch in the future. When meeting Ted's serious girlfriends, Lily tries to imagine them sitting together, playing cards with her and Marshall when they're all old. There are a few imagined flash forwards to the porch, and Barney is never there.