I feel some of these players won't leave their already contending team unless said team is going in another direction. Say for example, this year and next year, Cavs fail to make Finals, LeBron can bolt. But players like Davis, or even KD, I find it hard to believe they will leave their current situation regardless of what happens. Their respective teams will make huge contract extensions before that happens
While the part of large extension is true about Davis and the other top guys still on their rookie scale contract because they can extend for up to 5 years starting at the max. But for veterans like KD, they are limited to a contract length of four years, so if he's in the last year, he can only add three years. The extension starts at 107.5% of the last salary in the current contract. So veteran extensions are rare among top players because they are leaving years and money on the table vs going to free agency.
The Wizards are going to make an all-out push for Durant and try to bring him home. They have only Wall, Gortat, and Humphries on the books as well as the qualifying offer to Beal who will be restricted and they have plenty of money to give KD his max, add some bench pieces, and then use Bird Rights to retain Beal.
If I'm OKC, I'm more than a little nervous about being able to keep him.