Freddie, sticks around, finds another band, carries them to success, goes on his own, has an Elton John, Billy Joel like solo career.
John Deacon finds a spot somewhere, being a songwriter for a band that is so, so. They fade away, and he has a career of obscurity.
Roger Taylor eventually gets pulled into a great band, but is just the drummer for somebody, eventually getting some kind of solo work done.
Brian becomes the great tragedy, going to the top in the Astronomy game, abandoning music professionally, depriving the world of his musical greatness, but adding strong work in science.
Thank goodness we will never know.