My prediction is that DJI, possibly pressed by FAA and bad public perception due to accidents, will hardcode the limit to 400ft, with locked firmware that cannot be rolled back or modded.
If this happens, we mountain flyers, are ****** and will have to look elsewhere.
I think it will stay 500 meters. because that would screw a lot of people especially the mountain flyers and people hiking, but as far as firmware rolling back I think we're screwed!