I think Wright will be batting 6th before June. Maybe Willie's thinking is that he'd rather set a goal for Wright; meaning it's easier to move him up in the order than down. Either way I think Wright will force his hand fairly quickly unless the entire Mets line-up really overachieves.
I think there's some merit to batting Beltran higher in the order than 3 but it's not going to happen.
I'd be surprised (barring injury) if this isn't the line-up by June:
Reyes
Matsui
Beltran
Piazza
Floyd
Wright
Cameron
Alphabet