Its been over 100 years since we first flew and we still use analog radio with parasites and "radio effect" which changes your sound.

Why don't we ditch the old system and make a mandate a new law where any aircraft that wishes to fly in a controlled airspace has to be equipped with two digital radio communication systems?

What would the coverage costs be like? Doesn't digital systems require less power and antenna size etc to work which would make it better?