If you are interested in seeing a cheaper, DAC-less Sonos Connect to provide a digital only output for your AV amp, dedicated DAC or actives with inbuilt DACs then you may want to support this idea over on the Sonus forums.
https://ask.sonos.com/sonos/topics/simpler_connect_device_no_onboard_dac_just_streaming
https://ask.sonos.com/sonos/topics/simpler_connect_device_no_onboard_dac_just_streaming