"Slope of Enlightment" assumes that the peak excitement of the technology is already behind us. I don't think we've seen that peak yet. VR in the 90s never came close to living up to expectations and was a dud.
The peak is yet to come in my opinion. When the oculus consumer version comes out, people are gonna go crazy and predict that we're all going to live in the virtual world very soon. That won't pan out in the short-term, but we will slowly get there. That's when the Slope of Enlightment will hit.