I would tend to disagree with some of what you say.
The Canon 5DMlll camera is a stills camera first of all and it can make consumer quality video. Enough said.
Most people will be using a drone for wide shots and depth of field will have no impact. Having said that, I understand the need to get up close sometimes such as hydro electric workers on a pole and you want to get in real close with the background out of focus. I get that.
I have been in the business too for 30 years and I shoot with full frame Sony gear, the leader in TV technology and the most sought after company for professional gear. The Alexxa is used for movie making, but it is not generally used for day to day TV filming.
The Canon cameras whether they are the C300 or the 5D cameras, are only industrial or consumer quality. Mind you, they are good enough anyway for most aerial shots.
I think the big Octo drones carrying big cameras are on the way out due to safety regulations and other reasons.
What DJI is doing with their smaller cameras is impressive and I think the X5R will be adopted for aerial movie scenes because of its small size, safety net, and ease of use with the Inspire, relatively speaking. The X5R, with the ability to shoot RAW, for movie making will be a wonderful thing, but RAW for TV shows is a waste, as is the X5 non RAW, as it apparently has focus issues and sensitivity issues etc. The X3 is great as it is right now. I'm hoping they will up the bit rate to at least 100 mb/sec soon. The X5 is also 60 mb/sec. Unbelievable!