Haven't seen anything about a replacement on the Intelsat site, but you would think after getting the PBS muxes they would have some plans (could be a satellite from another orbit in the east, for example). AMC-21 was launched in 2008, so was a two year newer satellite they left. Plus, Galaxy 16 does have C Band, which is probably where they make there money. Depends on how much fuel is left for station keeping.
Also makes you wonder about Galaxy 19 at 97W, which was launched in 2008, also reaching its 15 year lifespan.