Whether or not their "subscription DVR service" fit within the legal loophole they were trying to take advantage of doesn't change the fact that it's pretty rich to build a service like that and then go around saying that the people whose content you're distributing -- the people who create the content that is the sole basis for the existence of your business -- are "fat cats" with "unfairly advantaged business positions."
Aereo made it easy to take advantage of something that is already free (and free by law). That was going to cut into the fat cats margins, so the fat cats got them shut down.
The system definitely needs to be rethought. The sensible thing to do would be to simply get rid of free public broadcasting and the associated copyright exceptions. Free up the airwaves, and let broadcasters sell content directly to cable and internet companies. But as Netflix is finding out, content is king. There is little room for simple middle-men like Aereo to make money when they can't get content for free.