For me, I have no interest in WiFi for streaming images off to the internet. Most of my photography is done outdoors and very little of it is done in Wifi range of anything... probably a quarter of it is done outside cell phone range....
What I was interested in, was the ability to remote control the camera. That will be missed... and no WiFi SD card is going to give me those abilities.
With the attached Image I set the 1Dx + 300f/2.8 II on the RRS small Metal Tripod to get the Camera down Low, attached to the CamRanger, in the middle of the Track, drove off 100 meters behind some bush, monitored via my iPad Mini in the vehicle, adjusted Focus via the iPad Mini, shot the Image via the iPad mini/CamRanger as the Mum & Cubs approached the "strange looking" object in the middle of the path.
The Image isn't anything wonderful, but I just like it as all the Animals have that look of being intrigued, although Mum did have a constant frown & look of suspicion. Difficult to get this sort of Image from a Vehicle, not impossible, but the CamRanger opens up new avenues for Imaging that had been almost impossible before.
Only real issue I've found with this method is shooting Lions, they tend to eat the Camera, not good.
This works well with people, too. With street photography people almost always notice a big lens pointed in their direction if it has an operator standing behind it. Place that lens and camera on a table and look away towards your phone and you can achieve some interesting candid shots.