The fastest CF/ SD cards are still way more than capable for everything that this camera needs and way, way cheaper than CFast/ XQD. Sure, those speed merchants will allow continuous 170-200 RAW before the buffer fills but when did you ever actually do that? I can't remember the last time I had buffering frustration with any recent body.
A day after launch, it became the fastest selling camera on Amazon US which is some feat. Preorders obviously but the intended market has emphatically endorsed it. 5D's are the most used cameras (excluding phones) on flikr and I am guessing that is unlikely to change. It's definitely not for me, but others are clearly happy.
What may change is video sector acceptance. The mk 2 transformed that market. Who would have thought that? Whilst the mk 4 is still offering exceptional video performance, Canon's deliberate omission of C Log, clean HDMI out etc and continued use of memory hungry motion jpeg will alienate many. It's not their inability to offer these, just deliberate marketing policy to protect the Cinema range (C300 mk 2 etc) products.
Bolts commented about this using basic technology. It's hardly that. How many other cameras have DPAF and DP RAW which allows you to adjust bokeh, micro focus adjustments etc? Horses for courses.
Talking about basic, I think that other makes need to fix an even more basic problem, battery life. It's no good having wunderkind features if you need to keep changing batteries so often or negate one of the key features of mirrorless by adding weight with a vertical grip, just to get decent battery life.
I watch NAT GEO's live streaming of safaris from Sabi Sands most days and their 'go to' camera is the Sony Z150 which is an amazing piece of kit but when one of their cameras had an argument with a tree recently, they swapped to an A7 DSLR, rigged up on the back of the vehicle. Picture quality was excellent but I lost count of how many times the feed died and an apology went out 'sorry, just having to change batteries....again!' In the end, I think they gave up. I don't even bother to have spare batteries nowadays as the 1DX seems to go on for ever. The new Nikon D5 seems even better still.
As has already been mentioned, the mk 4 is designed as a very high quality general camera, not just sports specific, to appeal to a variety of users. 7D2, D500, 1DX2 and D5 all look after that segment.
Rear view showing, power, input and level controls, also the boundary filters allow you to place the loudspeaker anywhere in the room and adjust to your taste.
Simply add a dac/pre such as PrismSounds new 'Callia' for an elegant active system which will hugely outperform far more expensive traditional passive loudspeakers.
It's worth labouring the the point about the crossovers. I genuinely haven't heard any difference when I've heard the obx versions and the external crossovers are massive and very difficult to accommodate. Best mid range I've ever heard and they totally disappear when set up right. I'm not sure there's a better speaker if musical connection is high on your list of priorities