I kinda agree with some of what you say, but "emo" wasn't a termed coined by the "listeners" and/or "trend-starting teenie-boppers." It's actually said to have been coined at an Embrace show (Ian MacKaye's band after Minor Threat and before Fugazi). Which goes to show also... that meanings can over periods of time, since what many call "emo" today, has a different sound than what "emo" was used to describe yesterday.