Well, let's look at gaming 20 years AGO.

20 years ago the NES was king, correct? So on one hand you can look at how far graphics, system architecture and game complexity have come, but on the other hand you can say that the general idea of gaming is still the same: consoles, media, controllers, playing on a television, etc.

The wildcard variable is of course the Internet, which was not a factor 20 years ago.