For Television viewing, it will make no difference. Even a 2 mp image will look great on TV. If you want to print it, that's a different story.
Same for video on TV with the inspire. The X5R series will look EXACTLY the same as the X3. Same for the X5. Don't get caught up with all the marketing hype from manufacturers enticing you to by RAW etc. The only advantage with the X5 would be low light capabilities. However, we are not supposed to fly at night or when it gets dark anyway.
I disagree somewhat, in photography once you get past a certain level of quality the advantages get harder to tell, but they are still there if you have the eye for it.
Put an X5 and X3 side by side, take a photo, 100% of the time you'll get a better image out of the X5.
On top of which you can change lenses too, so if you do survey stuff, or are limited to how close you can get to a subject as you are by law, then again, it has more scope.
Extra megapixels can help too, going from 12-16mp is more useful than 16-20mp. Its just nice to have that extra crop factor + in conjunction with 45mm lens, you could attain level of detail the X3 can only dream of unless you fly right up, risk breaking the law, losing license, or just having an accident.
Lastly, if you do this for money, it can give you an edge over the competition, in terms of marketing.
The X5 looks like a serious bit of kit, the X3 looks like a webcam.
Also for photogrammetry (an emerging thing), the extra megapixels are worth it as they will translate to more detailed 3D models.
Don't get me wrong, DJI are taking the piss with the cost of this thing and its not good value based on cost, but it doesn't change the fact there is nothing this practical out there and in the right hands its more powerful than the X3.
I bought the X5, but I am selling it before I got to use it, simply because I have seen enough to know that while its better, I would be better off saving my pennies, this time next year, I think there will be something truly special for decent money. if not I will re-buy it.
DJI NEED THE FOLLOWING for their next inspire..
1) Redundancy.
2) Auto parachute.
3) Auto avoidance.
4) Built in micro lipo which kicks in if main power source is lost.
5) Camera which does PRO-RES @ least 100MBPS 10-12bit.
So I do share your general consensus about this craft, but it still has its advantages.
I still think the best bang for buck is a phantom 2, h3-3d, hero 4 BE with 5.4mm lens.
That things can be bought for less than £1000. When the go pro 5 comes out, you might well find many people will go back to it if it works on the existing gimbals.
8k video, at 100 MBPS/ISH, for less than £1200 + 1300g all in. Sounds tempting.