Having worked in the Direct Mail industry, I hear that a lot. My father was a mail carrier for 40 years and hated it with a passion. That being said, it's a multi billion dollar industry that affects the United States Post Office and the myriad of trucking companies and brokers that move the freight. Junk Mail isn't going away any time soon. Outlawing it would have such a disastrous affect on the economy and I'd be out of a job lol.
For the longest time, Direct Mail thrived through the newspaper but more and more, companies are focusing on Mail and to a smaller extent, Digital. The amount of data that is out there in regards to demographics and household is Big Brother scary to say nothing of the new technologies they're working on. In the distant future, it'll be replaced entirely with digital ad programs but until then, you're kind of stuck with it.