they need something to make the sickness go away
Well i did some testing around with Oculus (v1) developers edition some time ago.
They are very nice and great to show off to your friends and all, but this is how far i got to using them, the v1 version was only good for demos and such.
Trying to use them for extended periods of time, "real use", without getting sick proved very hard, for me at least.
And some demos where better at making you puke your guts out than others.
Few demos have ever managed to make me get cold sweat all over and make me pull off the glasses last moment while trying to find a spot somewhere in the distance to focus on and breath in cold air to avoid using the bucket under my desk.
Now, i hear that the v2 version alleviated the sickness inducing movement by improving head tracking and using external IR sensors and such, but apparently it still caused problems (haven't tried v2)
Personally for me, i fear that the only way for these to become 'usable' is to find a way of taking motion sickness away.
I should mention i don't usually have problems with motion sickness, being able to do roller-coaster rides, reading a book while traveling, watching 3D movies, etc. But the glasses managed to get me sick just fine.