Maybe bonk will end up being busted, smarter people than me certainly think so, but this debate has been based entirely on theorycrafting by people who are far too lazy to actually see if it is.
There is counterplay to bonk, and its main uses seem to reward aggression and pushing, which could do a bit to alleviate the defender's advantage that people complain about in this game. But that's just my opinion, and we don't need to fill up another thread with hypothetical hearsay and fearmongering.
I remember the chicken littles that came out when Cow Mangler was unbanned but while it may be better than stock the "Med Drops to Charge Shot" epidemic that people predicted never seemed to materialize outside of twitch highlights.
Now that every player can test shit like bonk and soda popper in scrims, this sort of baseless whining is worthless. We can base our opinions on evidence now.