Ideally Stuart stays for a cup run. If he then decides to leave it'd be great to trade his rights for a mid range pick. The only problem with that is, in my eyes, the only (California) team that would really like to get him (based on roster needs etc) would be the Ducks. For the Wings to be able to trade his rights there would need to be desire from at least two of those teams. Personally, i don't see that as a likely scenario. Especially since there are some good UFA d-men this summer I doubt ANH/LA/SJ trade anything for his rights when they can try and get what they'd want for free on the UFA market.
What about the Kings? Still California. I'm sure the wife might consider a move as long as it's still California.