MPLS core networks that use Label Distribution Protocol (LDP) are common in SP core networks and have served us well. So, the thought of pulling the guts out of the core is pretty daunting and invites the question why you would want to perform open-heart surgery on such critical infrastructure.  

This article from Andy Mulheirn attempts to explain the benefits that would accrue from such a move and gives a high-level view of a migration strategy.

Andy Mulheirn The Data Plumber is a network engineer based in the south of England working for a company called Axians (formerly Imtech ICT) which is a Juniper Elite Partner. He obtained CCIE number 16500 on the 6th July 2006 in the routing and switching track. While he loves his job, he’s not malodorous, doesn’t stutter, respects your personal space, and would never spit on you while speaking about something crushingly dull. He does have outside interests and a Christmas card list that is longer than he cares to buy stamps for.