I don't see the lakers giving us a good prospect like Jarvis.
How hot a prospect is he? He was picked in the 20s and barely plays. Prior to Bynum getting injured the Lakers were competing for the best record in the west. They may actually be just one player away at this point, and getting someone like Smith may help them a lot in maintaining good seeding position and giving them depth at a position they have little at.
I don't know for sure that they would do this deal, but I think they'd have to think hard about it. If Kobe has a good year this year, it's going to stop him from demanding out next year. Getting Joe Smith for someone who's not going to help this year or next year and may never pan out into a good pro may be a worthwhile move for them.