The question is not how UA will change? As things stand they won't.
It's about how we as airline customers can ensure that this outrage continues, that it doesn't get swept under the carpet by the next Kardashian story, so that it forces UA to make changes. Passengers need to have solidarity in the face of corporations who, in collusion with regulatory bodies and the police force whom we pay to protect us from businesses like United who want to bulldoze us, steal our money and drag our bodies down the aisle.