Coming from an M's fan that has watched with horror the last 3 years --- I hope he does get better, but I don't see it happening. He'll be 32 next year, and since the last month of 2011 he hasn't hit over .200. And it's not like it's a steady .196, either...he'll have a "hot" series or two (and probably hit his dinger for the year) or so and then be utterly craptastic for the next 3 months. Like .125 craptastic.
Now he's a magician with the glove. But if you stick with him (like the M's did for 2+ seasons after he stopped hitting even .240) then you have to understand the bat's never coming around, he's going to be your #9 and probably hit worse than your pitcher would, and live with it.