Google announced back in 2013 that they would be phasing out their support for the NPAPI infrastructure. According to the latest on their developer forum, they're on track to have that work completed by the end of 2014.
Silverlight is one of the plugins that relied on NPAPI to power much of its functionality. However, Microsoft seems dedicated to supporting Silverlight 5 in Chrome for Windows through 2021.
As one of my colleagues put it, "The suspense in this season is just great!"