Probably Freddy ends up somewhere in music, not sure about most of the others. Brian May might have not joined however, he was actually on the cusp of becoming a Doctor of astrophysics when he chucked it in for Queen, (he finally finished his doctorate a few years ago).
Maybe Doctor May decides he can get more out of science than music, becoming fairly well known in the community and appearing occasionally on
The sky at night (though he does that otl anyway

). Much like sir Patrick Moore he is also known to be quite the gifted amateur at music, and is occasionally mentioned in footnotes as an
almost member of Queen (or whatever Freddy forms in that time line). Sort of the Queen Pete Best.