Bear in mind that the function of the Supreme Court isn't to propose new laws (legislate); it's to rule on existing laws. By its own mandate, the Supreme Court does not serve an innovative function in government. It serves an examination and arbitration function. If we want to change anything here, we'll have to start in the other branches of government, or else bring a case that sufficiently challenges the Copyright Act.
You are confusing enactments (things like the Constitution and statute law, like the Copyright Act) with precedent (prior rulings of courts applying the same law). These are fundamentally different things, thought the court looks to both
Nevertheless, I think my point still stands. Court needs to find, sort, and prioritize reference points essentially.
2. Roberts has a deep and wide judicially conservative record. He cannot be called "liberal" in the context of American politics; it's not even up for debate. The man and his judicial practice is as conservative as they come.
3. I really don't see why it matters. The justices' political leanings have nothing to do with whether or not their decisions are "correct" or not (although it may provide insight into why they decide one way or another).
[0]www.heritage.org
In a nutshell, the dissent would have also ruled against Aerio, just for a different reason than the majority. This sentence from Scalia's dissent should put things in perspective:
"I share the Court's evident feeling that what Aereo is doing (or enabling to be done) to the Networks' copyrighted programming ought not to be allowed."