Lakers chance of making the playoffs are staggeringly low and they are too far behind to even consider getting a sixth seed. Nash went to the Lakers at another attempt for a ring. Seeing as that likely won't happen at this point I believe the Lakers should be trying to move Nash to a team that is a buyer right now. I haven't looked at contracts, but I believe the teams that could use him are The Grizzlies (off the bench), the Pacers (Off the bench), and the Heat (starting over Chalmers), and the Jazz (starting.)
Looking at Nash's contract I think the Grizzlies and the Heat probably can't get him. However, the Pacers could move DJ and a filler to make the contract work and they vastly upgrade their back up PG position as well as improving their biggest weakness, the offense.
Since Mo Williams out the Jazz could use a starting PG to improve the team's chances of making the playoffs or even possibly getting an upset. They also have some moveable pieces that may seem attractive to the Lakers.