There is very little that could be improved at his point with the physical P3 itself. Stability and performance are excellent at this price point. DJI's biggest weakness is software. They have consistently been 3-6 months behind on delivering the software features they promise at release.
The weakest part of the P3P is the camera, and most of that can be fixed in firmware. DJI is a UAS/multirotor/drone company, not a camera company. They have made some great leaps this last year and have finally delivered a camera with a nearly flat lens, because not everyone loves fisheye or dealing with fixing it in post. If DJI is smart (and humble), they can pay their SOC supplier (ambarella) to come in and clean up their firmware and really maximize the potential of the camera hardware they already have.
The next generation camera camera could also move up to the Ambarella H1 SOC which is capable of 1080p at 240fps for the action videographers or 4k 30fps with H.265/HEVC for cinematographers.
They could go a different direction and switch over to using the Inspire camera and mount (maybe software restricted so we can't see legs?) with their factory supplied ND and UV filters that are easy to swap out. I severely doubt this would happen, but if they could come up with a version with a quick release camera and foldable legs we could get down to a briefcase sized carrying package instead of the bulky backpacks and hard cases we are forced to deal with now.
I would really love to see an "Inspire Mini" with the same general design but scaled down to P3 props and batteries, but with the same interchangeable camera system. The biggest advantage of bring down the size would be to get the whole package into a carry on sized case (23"x14"x9"). A P3 sized inspire could potentially fit into a thick briefcase with the props on for the ultimate portability and rapid deployment. The interchangeable camera system could finally open up the market for major profit with specialized cameras to fit everyone's needs instead of the "one size fits all" compromises we are limited to now.
When you get interchangeable cameras into the consumer market you open the floodgates of possibilities for specialized applications and needs. Everything from wide angle FLIR for agriculture or narrow angle FLIR for search and rescue to massive action cameras (have you seen Sony's new 960fps consumer camera?) to longer range telephoto lens that allow you get crowd videos while staying safely back from the crowds. When you separate the camera from body you allow the innovation to uncouple so that DJI can release updated flying platforms and updated cameras separately, as each improves, as long as you maintain compatibility of the mount.
Look at the camera industry for a similar analogy. Separating the body and the lens allows for advances in both while encouraging consumers to upgrade the parts that are most important to them. I can still mount a 30 year old Minolta lens on the latest, greatest $3200 Sony camera body because it gives me a certain look and feel I'm trying to achieve.
Think of the opportunities when you separate the camera and the flying platform:
- Need entry level? Pair a phantom and a 1080p camera module and upgrade later to a 4k camera.
- Filming action video? Upgrade to the super fast 960fps action camera.
- Search and rescue? Pair the dual battery Matrix and narrow field FLIR camera.
- Cinematography? Upgrade to a dedicated videography camera with fixed CP filter, quick swap ND/UV filters, and 400Mbps AVC recording.