They are excellent reasons. The problem is that the fanboy in you is too excited to see Bogaerts in the majors
There's more than enough reason to wait until he's a finished product to promote him to the Majors. I would be a lot more inclined to agree with you on the timetable if the Sox didn't have not one, but two capable SS on the roster. If the need arises due to injury or ineffectiveness however, then your timetable becomes more realistic.
But why would they get rid of Drew or Iglesias when they are both currently excelling on the field and at the plate?