Time to trade Kubina?

The Leafs have a wealth of quality defencemen, something not seen in years. With Luke Schenn staying in the NHL for the year, there are a total of 9. In the midst of a redevelopment season and numerous promising youngsters sitting in the press box i.e. Colaiacovo, is it time to trade the veteran 31 year old Kubina? By moving Kubina, the Leafs have a chance to develop the once very promising Colaiacovo. Kubina, who makes $5M a year for the next 2 years, is one of the Leaf's most steady defencemen. In return, the Leafs would be able to acquire a top line forward or some promising youngsters.