Other sources of news - radio, TV, and the internet. And other sources of commentary - radio, TV, and the internet. And other sources of advertising - radio, TV, and the internet.
Newspapers aren't in the paper business. They're in the news business, and commentary business, and they're really in the business of finding ways to get you to see advertising.
[Edit: Newspapers mostly don't compete with other newspapers because almost all cities are down to only one newspaper. Their only "paper" competition is USA Today.]