20fps burst with AF checked 60 times per second without any viewfinder blackout is way better than X-T2
It has way more phase detect AF points, spread over much more of the image.
It has way better battery life despite having way more horsepower under the hood
The electronic shutter has no rolling shutter issues
It has in-camera 5-axis IS
It's full frame
Just because another camera comes out that's better than yours doesn't mean your camera gets worse. You can be excited for Sony and for people who will buy, use, and love the camera, all without having to hate your gear, or feel bad about yourself. The a9 is objectively better than the X-T2 in basically every objective way, and yet the X-T2 will probably do just fine taking nearly any photo you could want to take. It's okay. Take deep breaths.