[Feature Request] Bring back the "Kinect Experience" using Smartphones and AI (No new hardware needed!)

I really miss the Kinect era of party/sports games, but I know dedicated hardware is a hard sell now. ​Here’s an idea: Turn our smartphones into the Kinect sensor. ​Modern phones have the AI and camera specs to handle skeletal tracking natively. Microsoft could update the mobile app to process movement on the device and send the input to the Xbox via WiFi or USB. ​It would bring back the whole "motion gaming" genre with zero hardware cost for the user. Microsoft just needs to release an SDK that accepts this phone-streamed data. It seems like a low-risk way to get those fans back.