The habs have one of the best and deepest prospect pools on defense, so the likelyhood of it becoming good is higher.
A top 6 of Guhle, Hutson, Mailloux, Barron, Xhekaj, Engstrom/Harris should be at worst an average group. At best, it could be great and one of the best in the nhl. It has eveything you would want in a d-corps: All are good to great skaters, all are capable of passing the puck well, all have offensive instincts, almost all are big dmen, several of them are physical, most of them should be at least decent at defending, and some of them have high end offensive skills.