Mirrorless is the way of the future. If you can eliminate a mechanical part that introduces shake why not get rid of it.
You can look at the current mirrorless bodies and say there is no way it would come up to the level of current DSLR's, but the mirrorless bodies of today will not be the replacements for DSLR's.

I have always heard the idea of a SLR was to give you the same light path as the lens that you were using. This can be replicated digitally now with an LCD viewfinder in live view. Just because they are mirrorless doesn't mean you have to hold the camera at arms length to shoot.

There are still a few limiting factors for a FF mirrorless still to overcome. Auto focus performance, specifically shooting action is one of the main.