Most importantly, he needs to stay injury free and healthy.
I'm a fan of Vandevelde and Garmin is the team I root the most for, but Christian is unable to win the tour.
He has a shot at aiming for a top 10 and the reason will be the same reason as why Hesjedal moved down another spot on GC, he'll probably steal someone's spot in the final TT. A podium spot might be too much to ask for, but I don't see why he can't be up there.
All in all, I think Christian should aim to win a stage at the tour. He has said he wants to make his final years memorable and I don't see why he won't give that a try.
if all goes well, he will place better than Wiggo.