Maybe it's time to curtail the music library complaints and accept where the controller app is headed.
My guess as to the near-future Sonos preferred customer implementation:
- A mobile device with bluetooth capability
- A streaming service on the mobile device
- A robust Sonos controller app on the device
- Sonos brand output devices (headphones or portable speakers)
There will be a steady roll out of improved and expanded capabilities of the app and the devices and the preferred customer will be a trend-motivated early adopter of the latest consumer tech gadgets who doesn't mind owning previously purchased products that have been discontinued and subsequently unsupported.
Just my guess.