On one hand, yes, it drives traffic. On the other hand, no, because lots of people just read headlines and maybe they can do that without clicking.
But realistically this the current Canadian government trying to shake down google and facebook for money to transfer to the ailing news industry in canada. The merits of the position for a link tax are pretty bad, and don’t really matter to the issue at hand. The government already gives hundreds of millions in grants and tax incentives to make the current journalism landscape in canada possible, without even looking at CBC the national broadcaster.
This is just a shake down job. They see google and facebook have a ton of money and the government thought they could threaten them into parting with some of it. The government doesn’t care about the implications of a link tax on the web, or mutually beneficial relationships, or any of that. It’s a shakedown.