rokket2201, I suspect you might be a young person just starting to be interested in aviation and how it all works? If so, good. Without new ideas and questions coming along, nothing ever advances.
Some ideas will be great, but take time to develop, and some ideas... well... not so much. In aviation, nothing can change fast, and it would have to change worldwide. And things DO change for the better over time as new technology comes along.
ATC are not the sole users of radio calls made by pilots - pilot to pilot communications may be 50%, and to-from ATC the other 50%.
And that's all I have to throw into this one.
Oh, the use of VHF..... I think we're stuck with it. If something else was better, it's impossible to flick the switch and everybody starts using the new thing at midnight on 1 January 2030.
Think of it as deciding to all start driving on the other side of the road - from midnight. It wouldn't work. You'd have to stage it - say cars with number plates ending in an even number switch over at midnight, then next week, cars with odd number plates switch over. What could possibly go wrong!