I don't think we'll ever see an unlicensed wireless system that will work for pro audio. I spent 20 years designing SCADA (Supervisory Control And Data Acquisition) products and systems. Early systems used telephone interconnects. We started using radios in the late 70s. It was a challenge to get 600 baud audio working on those early RF systems. Even though dedicated (licensed) 900 MHz data radio frequencies and products for them existed, nobody wanted to spend the time and money on a licensed system, so they'd buy competitors products that "worked" on unlicensed frequency radios. Almost every one of those sales losses turned into a sales opportunity down the road when some elected official's basement flooded with sewage because a lift station down the street had a pump failure that went unnoticed because the control center couldn't communicate with the lift station controller due to interference.
As soon as a failure significant enough to make the news occurred, I'd have the local sales guy set up an appointment with whoever had signature authority and I'd go in with 2 $25K pieces of RF test gear and proceed to show them just what RF interference looks like and why their fancy new system was never going to work. I made really good money cleaning up other peeps messes!
Point being for this thread, there is SO much RF around nowadays that you're almost guaranteed some kind of interference. Just check the wi-fi in your neighborhood. My cell phone shows more than 20 other wi-fi routers in addition to my 3.
Cheap, unlicensed wireless won't cut it for pro audio. Expensive, dedicated pro audio wireless systems will. Mostly.
Give me a $40 Mogami gold cable instead.