While components of the federal budget have intense lobbying efforts dedicated to them, the budget as a whole doesn't. Which is why there's no incentive to pass

While components of the federal budget have intense lobbying efforts dedicated to them, the budget as a whole doesn't. Which is why there's no incentive to pass a full budget: there's no bribery in it, and lots of political points to score by refusing and blaming the other guys. The copyright lobby, on the other hand, is a reliable bribe source every time they want something. So I'd expect an extension to just glide on through.