I'll add one idea to the list: tracking moving objects using IBIS.

Like when you shoot moving car or flying bird - use existing autofocus to detect the object and then track it over exposure time to keep it free from motion blur but get nice, blurred background. Pentax have simple version of that for tracking stars mentioned in the article but I hope some company figures out how to do it for arbitrary, fast moving objects in real-time.

Sony a9 series already got rid of blackout during shooting so it is technically possible to get image data in realtime, have continuous autofocus and save full size RAW files at the same time: https://www.youtube.com/watch?v=_ZXFI-eIXk8