To state the obvious: no one knows whether racing w/o radios is (a) more exciting and (b) safer. Neither can be answered from first principles. Neither issue would be easy to resolve with data. It would be interesting to look at crashes and see if they correlate with being on the radio, as is done with car crashes and use of cell phones, texting, computers etc.
I would go with a radio ban because (a) aesthetically I think it looks cooler to see the riders out there not constantly fiddling with their electronics; (b) although safety issue is not settled, I think one has to be concerned about effects of radio chatter, and using hands to activate the mike, on alertness and bike handling, as with cell phones and driving; (c) reduces team budgets; (d) if it's bad can always go back.
finally, does anyone know WHEN the radio ban is actually supposed to take effect - the pros are still racing with radios, right?