I cant wait to have that on my head for 6 hours at a time, with headphones too!

It won't catch on, its just a new fancy gadget.

What has caught up with us is mobile gaming specially in the iPad . I rather game on my PC, but this form of gaming is dying slowly.

Needs to have a counter-weight behind the head.

From Factorio's website:

You will be mining resources, researching technologies, building infrastructure, automating production and fighting alien enemies. Use your imagination to design your factory, combine simple elements into ingenious structures, apply management skills to keep it working and finally show your close combat skills in encounters with planet inhabitants who don't really like you.

Sounds rather familiar.

I think you are grossly underestimating the effect the Rift will have.  Augmented reality is going to be a drastic shift in how people play games.  Not to mention the fact that the Rift, and its technology, is applicable in many other areas outside of gaming.  Everything from robotics, to remote surgeries could be improved by this type of technology.  It is already used in military applications.  The other thing about Rift is that it is basically a prototype, or proof of concept.  The real impact that this technology will have, wont be decided now.  Check back in 5 years when this tech has had a chance to saturate the market.  There are still major flaws with this technology. 
There is also no other major competition.  When other companies start to compete in this area you will start to see major advances.  Given a decent amount of time the kinks will be worked out and it will be improved upon

on your second point.  PC's have the majority of the market, not the minority. according to

http://www.maximumpc.com/article/news/n … highlights
http://www.techspot.com/news/52070-pc-g … owing.html

nVidia and many others would like to disagree with you

"By 2015, DFC predicts PC game revenue will top $20 billion, roughly twice as much as PlayStation and four times as much as Xbox. Pretty staggering, isn't it?"

In the realm of MMO's the PC reins supreme, by a WIDE margin.  You are correct that the PC market is going mobile, but mobile != tablets.  It means laptops, especially, high-end laptops.  I would rather play a game on my laptop sitting on my conch or recliner chair, than sit in front of my desktop, especially if i'm gonna be there for longer than an hour or two.  The major problem that i see with tablets and other mobile devices is that no one has developed a control scheme that trumps the speed and accuracy of a mouse and keyboard.  Imagine trying to play any of the Staples of PC gaming with a touch interface?  Do you want to play Counterstrike, battlefield, COD, etc etc on a tablet?  I don't.  What about RTS?, RPGs? racing games?  The fatal flaw with all of the mobile platforms (for me anyway)  is that what I play, as of yet, is not practical on anything but a PC.

Can use it with this thingy too http://www.kickstarter.com/projects/194 … orite-game