I think I was listening to this as an audiobook about five years ago, possibly as a collection of short stories. Someone is driving through their town (in the United States, I think), and keeps seeing ads (I distinctly remember billboards, but it might have also been TV ads and the newspaper) with what looked like a retirement announcement, something along the lines of "Thank you, Gary, for 40 years of service. We hate to see you go" with the protagonist speculating as to who this person might be, who they worked for, and why the advertisements were so wide-spread. I think there was also a recurring mention of news reports of disasters, both natural and human, across the world. We cut over to a hospital bed where a man by that name is dying, and when he takes his final breath, the world collapses in escalating disaster, this man having been what was keeping it together the whole time.
I want to say that the man didn't realize this role, and worked as a very mundane businessman with wife and kids, maybe something in the banking industry. What makes me think this is part of a set of short stories (other than that the first bit seemed self-contained and the library seldom rents very short audiobooks outside of children's books) is that I vaguely remember another story, much more mundane, with that man in his younger years, where he and a woman he did not previously know suddenly start dancing to a street musician's music in a way that draws a huge crowd. I remember that he was wearing a suit when he started to dance, with mentions of how his suit was getting increasingly sweat-stained and at one point, he splits his pants while doing a more acrobatic dance move (the splits, perhaps?). Afterwards, there's an awkward scene where he and the woman have a sudden intense feeling of connection that almost leads to them rushing off to a hotel room before he starts to remember all of his other obligations, including his wife at home, and they both leave to their respective lives. I don't recall if the woman shows up in further stories.