Is there still tons of great content? Sure. Do the original artists have a right to go elsewhere? Sure. Could the other studios afford to take the hit? No. Would the other studios make deals with the other TV manufacturers? Probably. But because of their position, you as the owner of a Sony TV wouldn't get to watch some awesome movies and same for people who bought another type of TV. In order to reach a Sony TV customer, Sony would be forcing artists to have Sony produce their content, and that's where it's anticompetitive.
Stepping back to reality, how crazy is this analogy? Well how different really is an iPad from a 10" TV? Sony TVs play movies, music, have apps, etc, etc just like an iPad. Sure in the real world, you need a special partnership with Sony to install your apps onto the actual TV, but there's tons of other ways to get your content onto the TV. Difference here is that Apple has blocked off any of those other channels. And that's why it's an issue.