Public backlash which could lead to declining revenue.
Until the backlash became strong enough that hundreds of thousands of people started cancelling cable entirely, it won't have an effect. Rogers now controls the distribution of cable, and the distribution of the most important chunk of content to many Canadians, which is NHL coverage.
Even if there was a big backlash from people who decided not to order any Sportsnet channels, that lost revenue will be recouped by simply upping the price of other content. The only way they truly get hurt is if enough people decide to forego television entirely.
With the way internet TV is growing, there is some possibility this could start to happen. But...wait for it....Rogers is the main provider of internet service in Canada. So even if their cable TV empire starts to crumble, they will still prop themselves up with higher internet costs.
This is why some of us in here are worried, and rightfully so. Television and the internet is ingrained in our culture to the point that it has become a borderline essential service for most people. Today, one company took a big step towards monopolizing that entire industry. Now we can argue over whether or not TV and the internet is indeed an "essential service" worthy of the same consumer protection measures afforded to other essential services, but that's a debate for another time and place.