Perhaps longer term Shelvey will be pushed forward but I think that is quite difficult to pull of this season where we have too many attacking midfielders and no one that can play well in central midfield other than Shelvey.
Having said that though, if he were to make a good box to box central midfielder out of Wij or Moussa that would be amazing.
He tends to be play with two pivots, i'd be surprised to see any box to box players although our squad isn't suited to his system at all.