People are already salty that AR found a killer app before VR.
AR was always going to be cheaper to implement with existing tech that people have. It also has more practical usage than VR. I mean, how much work is it not to just get something to look like real, and react like you expect, but to feel like you expect? Meanwhile, the world already exists around you in AR. You don't have to develop teleporting methods of transportation so you don't get sick or anything like that.
The industry has been doing the proper baby steps with motion controls, 3D, and AR but VR is trying to leap frog it all and the reality is that it can be cool, but dev kits have been in developers hands for several years now and the expected barebores "VR" experience is still undercooked.
Say what you want about Pokémon Go's AR functionality, it's using the tech in an engaging way, within it's limitations. It's not all about the camera either, just overlaying Pokestops and Gyms in real locations adds another layer that....augments reality. Overlaying elements over a real world locations are easier than developing software that accurately detects geometry and surfaces from a camera alone.
At the very least, it finally shows people the potential of AR in a way that I don't think people really got before, and the social aspect has just made it even more of a phenomenon. By contrast, VR has had a much harder time to grab a hold of people since they have to try it for themselves to see the value and even then it's very expensive and there is no killer app.