Some believe that Durant may only be comfortable leaving the Warriors if they win another championship. Just as he joined them because they lost in the 2016 Finals, he may leave them if they win three straight championships, believing he's achieved everything he wanted with them.
Conversely, the Celtics' playoff success could play a huge role in Irving's decision. If the Celtics regroup and contend for a championship, he may re-sign in Boston, not wanting to leave a young, growing, talented team. But if the Celtics lose in the second round, that would be a disappointment and may cause him to go elsewhere.