It's a huge amount of money that an NBA player would want, Davis gets the championship at get's the biggest salary in the NBA, there's no reason to leave if Indeed the Lakers will offer him that amount, he even has a bigger salary than the king.
I'm sure Lebron doesn't mind that, as long as he and Davis will be healthy in the next 4 years and bring more championship to the Lakers, he will be down with that. And AD with his first ring experience, will definitely love to stay with the Lakers. The management seems to fit the puzzle together specially when he joined and continue the tradition of Lakers winning again.
In the long run, Lakers will be happy to pay him that big, win-win situation, and if the supporting casts will also stay, they are going to be very hard to beat as long as Lebron and AD are fit and well and mentally tough to make a run for another trophy.