Sounds great, but it seems like something Newegg or Costco's lawyers would have started on already if it were feasible.

Costco's golf ball case was filed in the state where it's headquartered: Washington.

Only because Costco pre-emptively sued the patent holding company in order to choose the venue.

True, but the point was, Costco doesn't have cause to do anything in East Texas.

Can you even sue a court? Seems too good to be true.

Not in this case. You would need to have standing and a relevant claim to sue any person or firm. I would think it would pretty difficult to show sort of generalized claim about the injustices of the patent system. That is a political question, not a legal question.

Class action by victims of patent trolls?

Could a tech company, as a potential futute patent holder, sue?

Yes, there are ways to sue the courts themselves, but not for something like this. The suit would generally be in the form of what's called a Writ of Mandate. It's basically a lawsuit for when you have no other legal recourse for something. For example, if you went to a courthouse and asked for a copy of a statutorily public document but they refused to give it to you, you could file a such a writ. It would force the court to at least give you a hearing before a judge, who you'd ask to compel the court personnel to give you what you asked for.

no - the best you can do is get it appealed to a higher court.