That's not only dumb, it's impractical. How the hell will you bill people for e-mail? Bill the ISPs? Yeah, that might work, but every single mail server that's not directly linked to an ISP will still be operating for free. Hell, I'll personally put a mail server up for free if that happens (though I'm not on the US, so I wouldn't be affected by that).
You can't force anything on the Internet. If people want to use something for free, they WILL. If people want to copy or distribute stuff, they WILL. If people want to talk without being noticed or recognized, they WILL. If people want to scream something to the whole world to know, they WILL. That's the beauty of the net, it's the first truly democratic system (well, maybe anarchist, but...) in the world. It's the first place you can express your opinions without being monitored or censored (if you want). All these stupid new laws, including the DMCA, will never put a dent in it - because the 'net is made by it's users, and the users don't want it.
Stupid congress people.