Consumers gave up their power years and years ago. The masses are far too lazy to use it, so the corporations have very little stopping them from doing whatever the fuck they want.
You cancelling your subscription has exactly 0 impact on anything.
One person cancelling their sub does nothing. 30% of your userbase cancelling will make a company take action (informal CNET poll estimates 30-40% planning to cancel).
However, you are correct that most people are too lazy to take action when things like this happen. That would be why cable companies get away with increasing fees at the rate they have.