I've always felt that Blue Note was just one of a number of independent labels that documented the music during the 50's and 60's. (I know that Blue Note began in the late 30's and still exists today, but those were arguably the label's peak years for recording and documenting the music.) Blue Note recorded a lot of great music, but so did Riverside, Prestige, Contemporary, and a number of smaller and shorter lived labels. You could also include a label like Impulse in there - even though it was owned by ABC Paramount, it seemed to have a certain amount of autonomy, probably thanks to Bob Theile's guidance and Coltrane's record sales.
I've always felt that part of the reason for the Blue Note mystique came from Michael Cuscuna's p.r. work. I know that during the 60's when I started listening to jazz and buying records, I was at least as interested (probably more so) in what was released on some of those other other labels as I was in what was released on Blue Note.