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.
Lebron will be almost 40 years old after the next four seasons. 
IIRC, his contract with the Lakers will expire after the next two years, and he has the option to become a free agent in the 21/22 season. Who knows, maybe he will retire after that.He's still a lot to offer for any team where he's going next. But I hope that if his contract expires with LA, he's going to renew it and will end up retiring with them.
I think he'll do that for Mamba.