Also to consider, some of these users may be waiting for a catalyst for that long awaited upgrade, which Horizons very well could be for a number of people. I for one, am looking at upgrading my current computer for Horizons.
Yep, that and VR. This holiday i'm upgrading from my gtx 770 (still a great card), to two gtx 970's. My goal is to be ready for the VR experience. I think they've made enough downgrades in this game already that affect those with fast systems. When I see someone with a dual core athlon and 2 gigs of ram running on Ultra...something isn't right there. Hopefully moving forward with the tech will enable them to do more and improve the PC experience.