Dish knew this was coming before auto-hop and even the Hopper was released. I'm sure they had legal already budgeted back in January, and know how much they are willing to spend on it, looking at it largely as any other marketing expense. The fact is they can stretch this out and garner a good bit of press for fairly small legal expense.
The doom and gloom, worst case scenarios are comical. Dish isn't going to take the company down over auto-hop. Wherever their line is, when they cross it they will get as much as they can and settle. Even if Dish is willing to go all the way, I think the nets would rather settle somehow than face a deep pocket on a precedent setting case.
Dish no doubt has a bigger picture that all this plays into with contract negotiations, etc. From the day auto-hop was announced, I thought it opened the door to a more hulu-like PTAT with some required ads with revenue split between Dish and the providers.