I think so too. I use the 1dx II as a second camera for weddings (though its shutter is pretty loud) and I would like to a have the resolution of my 5D IV.It would be wonderful to have a 1dx replacement with about 30 mp so it would be competitive with Sony’s offerings ( A9 ii is rumored to be in the 30 mp range).
I personaly dont agree with the "lowlight over resolution for sports cameras" vibe. The Lowlight performance of the 5D is good and the 1D is not noteable better in my experience. I think the higher resolution would be a great option for event photographers, so we can crop an recompose easier.