I'm not sure about game changer as game 'maker' - allowing people to make a new level/type of interactive entertainment. Maybe some types of game will actually get fully absorbed into VR - and 'changed' because of VR - but certainly not all.
As for the hype - the concept and dream of virtual reality is one that has been in peoples' consciousness for a long, long time. The idea of 'holodecks' and 'jacking into the matrix' and all of that - it's been an assumed end goal for at least one thread of gaming/interactive entertainment for a long time. The idea has fuelled fiction and stories, there is definitely a very strong appeal to the imagination.
We're now at a point where it seems one key step toward this end goal can be taken - immersive visual feedback. Was tried before, didn't really work, but there now seems to be new confidence it can be done properly.
I think this is why there's excitement. If we can take this step it would be the first big step toward that endgoal in interactive entertainment since 3D games themselves came on the scene.
It's not going to replace 'other screen' gaming (TV/mobile), but it's an addition that is key to realising one of the bigger dreams in computer/interactive entertainment and man-machine interaction.