I tend to look at what the player himself is doing or trying to do and put some stock in that when trying to determine where he might be going.
It has looked to me like Youk as a player has been trying to become less of a BA kind of hitter and more of a SLG kind of guy. Then looking at what he has been doing at the plate, it appears that either he is having some difficulty reading pitches as well as he once did or knows his quickness with the bat is in decline forcing him to commit to swing earlier than he has in the past. The latter would mean that his eye at the plate is as good as it has ever been but he is unable to get the bat going like he used to. The former would mean that he just cannot process pitch information as well as he used to. The latter is more likely than the former and really a combination of the two is just as likely as anything.
At any rate, I think it unlikely that his recent performance is an aberration and am more inclined to see it as a trend that might be interrupted by occasional signs of his past glories but not more than that.
Then you add that one of his injury issues is his back and you really do have a player that is going to go through a good deal just to stay in the ML, let alone play at a big salary level. An 800 OPS could be in range for him though at least in stretches.