I just don't understand why the change is necessary. If they can be operated at the same time I don't see what's the problem. I mean that's what they're doing now, right...? No one has really explained to me why this benefits us, is what I'm trying to say.
I explained why it's good in my first post 
They can't be operated at the same time unless you split up the spectrum! The reason it should all be digital, is analog is inferior, and analog wastes too much of the spectrum. An analog signal is highly redundant and provides no means for compression.
In theory the radio spectrum is harmless. But I'd hate to be a creature that can see or sense radio waves. Because an analog signal is like a softly sloping series of hills and valleys versus a digital signal which is like a saw tooth rail road track with teeth knocked out here and there. Of course satellites have been broadcasting in digital for years.
