Radio isn’t dead, the same as shopping isn’t dead.
The delivery method of what we all call radio is a multi platform industry and a streaming only station can be reasonably successful with the right content. However the clue is multi platform. Traditional transmission is in decline yes, but it’s not dead.
Streaming will be the way forward, but like FM and DAB it will take a while to feed through to the masses, especially in the car and therefore we are a long way from a streaming only station being a main player.