Well, it looks like whatever else people may like or not about 6D2, it's already an Amazon hit -
https://www.amazon.com/Best-Sellers-Camera-Photo-DSLR-Cameras/zgbs/photo/3017941/ref=zg_bs_nav_p_1_p
6D2 is the #3 bestselling DSLR. There are no Nikon bodies that are over $500 on the top 20 (the $500+ kits both come with 18-55 and 70-300 lenses).
The top 10 are:
#1 T6 kit $499
#2 D3400 kit $497
#3 6D Mark II Body $1,999
#4 T5 Kit $349
#5 D3300 Kit $447
#6 5D Mark IV Body $3,299
#7 D3400 kit (2 lens) $597
#8 70D Body $799
#9 D3300 Kit (2 lens) $495
#10 80D Body $1,099
#11 6D Mark 1 Body $1,399
#12 T6 Kit $359
#13 5D Mark 3 $2,299
#14 D5500 $727
#15 D5300 $489
One thing that's pretty easy to glean from Amazon bestsellers list is that price point is critically important. I'm actually shocked that all top 20 are Canon/Nikon, and that all of the pricier bodies are Canon.