Terry and Jonny V of DGN/Smashboxx discuss things along these lines towards the end of last week's show, starting around the 2:52:06 mark (but lots of really good general discussion about the DGN production from 2:19:00 onwards, for people who want a glimpse of what goes into the broadcast).
https://youtu.be/peE-6liHcAA?t=10326
Basically, like a lot of suggestions/demands that people have for DGN, this is 1000x more complicated and expensive than people realize.
Jonny is already completely overstretched with the video switching + producing required, with a whole team of people in his ear at all times. Top-notch broadcast teams have a wholly separate person who handles the audio switching, as it's a wholly separate task with different focus areas.
Ideally DGN would love to hire someone to do that, and they've requested it. But that takes a lot of money + equipment + training, that they could use instead to hire a replay operator, additional cameramen, paying for higher-quality video streaming, or countless other suggestions/angry-demands that people have for DGN. All of those things are extremely expensive, so how should they prioritize?