The kid is about 3-4 wins better than the incumbent. If those games matter to you, promote the kid after the arb period. If you need them for the minimum win requirement in your world, or if you're even a longshot playoff contender, or if you just don't like losing games, you should call him up.
If none of those are true, it's OK to leave him down, because (a) his low DUR holds down his OVR, so he won't ask for exorbitant contracts, and (b) his very high makeup is a strong predictor of a later, slower decline than most players, so you're likely to want him for the relatively modest amount he wants for that age 32 season. This advice is specific to this player-- in general, Mike's above logic is correct.