YOU ARE ABSOLUTELY RIGHT IN EVERYTHING!!!!!!!!!
Well, no he is not! I´m sorry but no! Because he is missing the most important thing, not everybody has his needs, not everybody makes photography or video like he does...And even so, there are solutions!
Well, let´s start for the video. If you are using a laptop and external drives to edit 4k video, then you are not a videographer. Maybe someone that like video and sometimes makes some fancy videos to put on youtube. If you need 4k and if you make videos professionally (and saying professionally is like earning money, not about quality), then you´ll need a lot more equipment. You´ll need a powerfull PC (I work with 2), you´ll need some raid sistems, or a powerfull worksatiton to storage your data and to be able to work your data. Working with 4k videos from an external drive is a potencial risk to ruin your drive. Also, if you work with a laptop and external hard drive...well....that´s not a suitable solution for 4k video editing. Unless you have a powerfull macbook pro, but even so, it´s not the most suitable...
Saying that, i do understand your words about video and storage....but not everybody has that opinion or needs...
About photography.....well this one i really understand less...He´s complaining about how hard is to storage photos, and how "heavy" are the 5ds photos? Did i get it right?? Well, this is like buying a Ferrary and then complaining how much it consumes in fuel....This type of cameras have specific uses. 50MP photos are NOT the kind of photos you want if you are going to the park making 400 photos of your dog jumping to catch a ball...But ok, you can use it for everything. If you don´t need or you think the 50MP are a lot to you, it´s so simple....just use lower resolutions!!!! You can do it in you options! But by all means, DO NOT say that 50MP´s are a lot and they are not needed in photography!! Maybe yes, it is too much for the dog photos, but for a lot of things, yes, you do need MP´s.
So don´t get me wrong, i am not trying to criticize..but i think we are talking of 2 different types of photography and video...a more amateur use and a professional use. And it´s ok to be amateur, but by all means, do not buy professional cameras and then criticize it because of the storage or if 4k video is hard to edit...That´s just not right!!
Regarding to the topic, I do believe Canon will make both cameras, one with higher MP, and a "fast camera". I think the first to come is the high MP´s pretty much because the lenses you have available. Doesn´t make much sense to me, launching a fast camera, when you don´t have a 70-200 RF, 100-400 RF, or the big ones (there are rumours of a 600mm DO for RF sistem, but only in 2020.....) So according to lenses, it would make a lot of sense to launch first the high mp. (Sony make that mistake with the A9, but eve so, they have launched the 70-200 and the 100-400 at the same time....)
Looking forward to see what´s next of Canon, the EOS R was a good surprise, but I am waiting a pro body to see if i leave my A7R3 and get back to Canon sistem 100%. Would love to have a A7r3 equvalent to work with the 1dx mkII.
Cheers