As valuable as Horford is, I don't think anyone would be willing to pay him over $30 million next summer. Horford will be 33 next offseason, so there's a chance he could opt out in order to secure one last big contract before he gets too old. Would he be willing to opt out in order to sign a 3-year, $75 million deal? Would the Celtics, or another team, be willing to offer him that? Those are the things Horford and his agent, Jason Glushon of Glushon Sports Management need to figure out before next summer.