I must say, a difficult question, as both methodologies have a different audience and way of use.  Although Kanban is of the same family as Scrum.  in fact, in my opninion it's a light weight Scrum with a more dynamic area.  I'm going to setup Kanban for our team here after my holiday (somewhere around mid november).

But about our question, Doug Shimp has wrote a nice blog article about it.  You can read it here: http://doug-shimp.net/scrum-faq/will-kanban-replace-scrum/