Yamaha is making a wireless preamp available(August) that may solve many 2 zone issues.
here's the link:
http://usa.yamaha.com/products/audio-visual/wireless_streaming_amplifiers/?selected=618403_618404_&mode=compare
I'm interested because I believe this would allow me to setup a 5.1.4 Atmos in my main room yet still have zone 2 control. My zone 2 now hijacks 2 channels from my Yamaha 2050.
Let me know what you think. is this a good possibility?