I recently bought a cheap system for my garage, significantly cheaper than Sonos 5.1 system.
That cheap system really surprised me. It has Chromecast and Airplay. Yes, Chromecast and Airplay.
Now I start wondering why I spent so much more money on Sonos system, and Sonos doesn't even support Chromecast. I think it is time for me to ditch the Sonos, due to its lack of Chromecast.
SONOS, please add Chromecast asap, otherwise you will loose many existing customers and future customers.