If only the Hero7 Black could do 4k/60 in Superview.
As someone that already has a Hero7 I don't see the DJI as an upgrade, but if I didn't have a camera yet or was looking at getting a second camera, the DJI is a great contender.
The main issues I see with it is just the lack of accessories compared to the GoPro, the timewarp, and the lower FOV. At it's price though... Definitely some competition happening. Maybe GoPro will finally have reason to really invest in some R&D and come out with much bigger generational upgrades. Looking forward to watching this race.