I fly a lot. I've seen delta increase offers to someone takes the offer and leaves happy many times. Sometimes it was me. My buddy who was traveling with me got off a plane for $ 450in delta bucks , a hotel room and a $75 food tab just last month. Offer that and people will be fighting over which one leaves. . They just need to keep increasing compensation until someone agrees to take it. You don't just remove someone after they have a seat