I can understand objections, but what about this: currently, wireless data and voice is carried over the same medium and is subject to the same network overload

I can understand objections, but what about this: currently, wireless data and voice is carried over the same medium and is subject to the same network overloads. Is it necessarily unreasonable for carriers to give priority to voice data made through telephony protocols (as opposed to data protocols)? I understand a lot of people are approaching this from the perspective of "how would this be abused?", but I think there is also worth in thinking about it from the point of an honest businessman in "how do I make sure my customers are guaranteed good service?"