Well part of the problem is that the law has yet to go about this in the right way. A problem with issues involving the gaming industry in general. Largely because nobody involved in a suit has had the brains to make the right kinds of demands or attacks... on pretty much any issue.
The point made about the jury seems like an insurmountable obstacle until you consider that even in a civil matter you have the right to demand a jury familiar with the subject matter, OR that the case be decided by a judge if such a thing is impossible.
Sort of like how a black guy involved in a civil action against a company based on the accusation that he was a victim of racism by whites, can object to an all white jury. Sometimes jury selection for civil cases can take a very long time if an agreement to have
a judge decide can't be reached and a very specific body of knowlege combined with neutrality towards the players involved in the case becomes nessicary.
I'm not an expert, and it wasn't the aspect of the legal system i studied, but I know the basics. Simply put what we need is for companies going up against something like Zynga to demand, much like a business-related arguement, that the Jury of their "peers" have detailed knowlege about gaming, it just hasn't happened yet. Granted this means Jury selection might take years, especially until the system becomes used to it, but sometimes that's what it takes. Civil courts have gotten better about coming up with jurors to sit in for contract disputes and other technical matters over the years, and really this is very similar to those kinds of business battles that come down to legal wording, understanding, and the cross examination of notaries and legal witnesses for their understandings.
Basically if we had Minecraft against either of the other games, demanding a judge, or an appropriate Jury is probably what Notch should do since his accusations of a knockoff are going to be based on gaming knowlege.