I will never forget the movie CHANCES ARE, also starred by Robert Downey, Jr. That was an old movie back in the 90s. This song, however is another story. It just talks about "who knows" as opposed to a planned life.
I have always planned my life because that's what I learned from my mentor. Somewhere, however, I had to abandon some of those plans not because chances are, I may fail, but because something unplanned came up. I do not regret planning my life, despite uncertainties...