Well, I'm not exactly ditching the X1, but I had always planned on getting one eventually.
With Crackdown and Scalebound on the way and the console price going lower and lower, the time would come when there's too many good games on it for me to pass up.
Now, with GOW4, Scalebound and QB going to PC, I'm much more likely to forego getting an Xbone and just play those games on PC. I was planning to build a PC this year anyway.
I think the long-term effects of this decision are much greater than some people here are saying. I'm pretty sure I'm not the only one that had planned on getting one eventually but is dissuaded by this move.
There's very few reasons left to get an X1 now.
Each to their own - personally I see plenty.