His arm ratings are still well above the recs for a 2B, so no worries there. Glove is just above average, so no harm there either.
Range is the only concern, dropping another 4 points. More balls will be getting past him for singles. You might start to see some minus plays, but that's about it.
I wouldn't be too concerned about his defense considering that it sounds like you have no other options and he should continue to be very productive offensively.