Call the Power Company?
So, if the power goes out, you can't call the power company to get it fixed?
That seems kind of ... bad.
And if my cable broadband connection goes down (which it does almost every time there's a thunderstorm in the area), I wouldn't be able to call the cable company to get them to reboot their darn router?
I'm already paying for a cell phone with nearly unlimited long-distance. Why would I pay for an Internet phone for the same function?
I keep my landline, legacy phone for emergencies, and for calls that involve account numbers or other sensitive information. (You can listen in on cell phone calls with gear you can buy at Radio Shack. Gotta have a wiretap to listen in on me ordering pizza when I pay with a credit card.)
Since I don't do long-distance on my landline, I pay less than $25 per month for it. Guess that works okay financially.