#3. Seth Rollins

Seth Rollins has been one of the three most heavily-pushed Superstars in the last five years. While three of his four World Championship reigns were short, he's always been an important figure in WWE. And from his debut in late 2012 until late 2015, he had never missed an episode of RAW. It was a streak that was close to three years and it took a devastating injury for that to end.
His babyface run lasted over three years as well, where he established himself as the face of Monday Night RAW. When looking at the current era, no Superstar is going to define WWE's flagship show more than The Architect.
He is to RAW what AJ Styles was to SmackDown between 2016 and 2019. Given his status in the company - one that only grows in importance, the chances of Rollins ever getting released seem close to none.
Moreover, he's always a reliable top star to put the World Championship on, which is exactly what WWE needs.