I was talking about this today, but lets say worse comes to worse and this is Beyoncé's last album ever.
Blue is the last song on the album, and the final song to her discography and it's actually beautiful. It makes the song even more emotional when you think of it like that. It's like her life is finally complete and she has achieved her aspiration of happiness, which is the opening statement to the album
(I still believe she will release at least one more album, independently with Parkwood)