My topic here is not an issue but more of a knowledge gathering where i would like to know more about the new WAN technologies in the market, what are the efficient ways of connecting two cities miles away from each other or countries or continents. Getting latency in WAN is a thing of past and there are better ways to get low latencies.
This line of questioning sounds very familiar to a school work.
Anyway, MPLS is not a "legacy". It's still there. Growing. The only thing stopping or slowing down the implementation of MPLS/VRF is cost and the knowledge skill.
Have you heard of WAN Acceleration? Have you heard of "dark fibre"? These two are predominantly used to link two (or more) sites together.