It's the nostalgia that is causing people to long for the Bruce Faulconer music. Nostalgia can make things people grew up with in their childhood seem pure and pristine.
I remember back in the day people who were partial to the original Japanese DBZ hated Faulconer's music because it never stopped playing in the background, as if Faulconer scored DBZ as if it was a video game or WWE match. I personally could not stand Faulconer's music for these reasons. I am glad that Funimation moved past that phase and I do not want them to return to replacing soundtracks just for a few unhappy people.
It's a lot more than a "few unhappy people," that score defined a generation of fans… and remember the '98 - 02 era was the high point in DBZ (in North America, to be clear) notoriety; e.g., playing cards, games, t-shirts, action figures, Burger King toys... etc... that really can't be denied (I'm 27 years old and lived in those times, DBZ was on fire and EVERYWHERE). Nostalgia goes a long way in the lasting success of a property...
The Japanese v. Faulconer argument will continue to go on but the proof is in the pudding, don't you think? (har har Frieza)... just look at all the YouTube videos with people wondering what the underscore is... oh wait, it's usually Faulconer ;-)