I do have a 1DX and I am not really thinking the 5D4 would replace it but it has many of the important features of the 1DXII at a much lower price.

The following summarizes my reasons:

I like to have a second body for the occasional trips I take and I am curious to see the image quality. Who knows, I might return it.

The 7DMKII image quality is really good when the light is excellent but otherwise I wasn't that impressed.

The two biggies for me are : all focus points available at f/8 and I had wished from the beginning that the 1DX had more resolution so I like the idea of 30 mp (also why I am considering the 5DSr)

Other features (not in the 1DX) I like: the silent shutter mode, built in WiFi, GPS, HDR imaging, multiple exposures and intervalometer.