I think many of the critisisms of the ESO M (and many other cameras) have a mjor flaw for how many people will actually use these cameras. They assume that any given camera being discussed will be the only camera, and must do all things. I think this will be actually quite rare amongst serious users.
1. Birding / wildlife
2. Landscapes, etc while doing 1.
3. Landscapes, etc casually.
4. Candid portraits and people pcitures in a major even setting (like a wedding, as a guest)
5. Casual social settings
7. Photo travel
8. Buisness travel with incidental photos
9. Vacation travel without it being a dedicated photo trip.
10. Formal portraits.
Now, a 60D with lenses suitable to varying degrees for 1-10 in terms of focal length and image quality. An elph, that I am never satisifed with image quaility except for strict documentation purposes. A blackberry, that gives results not that much worse than the elph, and is always with me.
For 2, 5, 8 and 9, the 60D setup is too large, and I have found I am often forgoing opperunities.
Where a mirrorless camera would fit in, would be to be a second body to hold a wide / ultrawide for 2., To be an easily carryable kit for 3, with a reasonably fast prime for 4 (and small flash possibly), and a much more comapct travel kit for 8 and 9.
What this kit does not need to do is the other major elements, where the flexibility and PDAF of a full DSLR are advantages.
a m4/3 system would cover this as well, but for many of these scenarios having some accesory or lens cross compatibility are nice.
Notice that none of these require blazing AF, or the speed of composition that needs a viewfinder (in too bright for the LCD areas).
WHat are your thoughs on this? Obviosuly I'm waiting for a few reviews to make sure the lenses are good, etc before biting.