Surely you don't think that Canon is incapable of building a camera faster than 30mp / 5fps. That's simply what Canon is offering for a midrange $2,000 camera.
The complaint that that 100 megapixels will slow cull and edit (ie files are too large), that isn't unique to wildlife. I mean, 1,000 photos at 100 megapixels whether it's a wedding or a day in a safari is the same thing, right? People make the same argument about the 5DSR (or the A7R3). I don't think there's any question that some people like the additional reach of that higher density/more pixels offers.
Regarding eye AF for animals, this will be a unique feature to Sony, when it comes out next month. I'm sure it will be extensively evaluated when it it's out, and yes, this sounds like a great feature, especially for cat photos, or for bird portraits. On the other hand, for A9/A7, I think it will be much less useful for bird in flight, because frankly, these cameras suck for bird in flight photos. The autofocus is just a pitiful compared to similarly priced DSLRs, and especially with lenses and extenders that have smaller apertures, the keeper rate is just miserable.
I mean, if most of my photos are not in focus at all, I'm not going to hold my breath that the eye AF will be meaningful
IBIS: it's coming, for Canon, right? At the moment, you either buy a camera with IBIS, or you buy a camera with DPAF. You can't get both, but soon you'll be able to.