EULA's aren't a patent defense though. Local laws can supersede them in certain instances. For instance, a major marketing point for XIV (and many MMO's for that matter) is the ability to join with your friends and play online with them. So far, SE has been failing on that promise to many. If it were to persist and become a point of contention in a class action suit, SE's EULA may not protect them if one can effectively state the case they have basically falsely advertised the product. It's not quite that cut and dry, but in the right courts and territories, this could be the case.

Something actually came up recently concerning PC Tuneup software, where there was a lot of back and forth over implied warranty, fraudulent advertising, etc.:
http://mirskylegal.com/2013/08/softw...anty-problems/

In the end all an EULA may do is provide a buffer in some areas, but not ironclad protection. Portions of it simply may not be enforceable in some regions due to local law.