Here is a short thought that you might want to consider expressing next time someone near you doesn't understand just how significant games are as a medium. Please think about how the people near you consume media. They watch movies, read books and so on and then share their experience with others. Possibly as humor or as tips for others to try, but essentially media is a connective experience.
Media connects people.
Games are interactive media. Not all interactive media are games, but all games are interactive media. And games are in majority multiplayer.
Games will therefore make the normal use of media more effective and/or easier.
Because of this, I believe that games will become not a mainstream medium. But quite possibly the mainstream media.
Please feel free to disagree, but I'm not all wrong am I?