I agree nobody should ever text while driving. Talking on a cell phone is a little different.
I've worked for several companies that have replaced mobile radios with cell phones and have not seen accidents increase. It's all about paying more attention to driving than talking. Sometimes in heavy traffic you just don't answer the phone. Sometimes you need to pull over to the side of the road to talk.
The fact that the guy on the bike was doing 85 mph in an area where there were side streets makes him as much, or even more, at fault than the woman on the cell phone. BTW, I've had more than half a dozen bikes. When you are on a bike you just have to assume that all the other drivers are idiots and don't see you.
I do support banning any one under 18, or maybe even 21, from talking while driving. At that age you are still learning to drive and don't need the added distraction of a cell phone.