I stand by my original theory here, that mirrorless has no identity right now. It's living in a limbo area, straddling the market of cell phone's and P&S's. That's why I see it as bound to fail. Cell phone shooters won't switch, they want one device to rule them all. And the average P&S user won't want to deal with interchangeable lenses - no matter how small they are. And for those that want the IQ, well, we have our slr's already! It's a proven system with decades of R&D. I don't think I'm far off in saying that most slr users would add or at least consider adding a mirrorless body to the bag if it fit the system we're currently using.
I disagree with almost all of this. The future of photography is higher end gear, cameras like those made by Fuji X, Sony NEX, A7, etc - not P&S or phones. The mirror / prism hasn't changed in any real sense from it's origin, no R&D needed. Yes, the DSLR w/OVF works fine (so did steam engines), capable of great work, but they will become obsolete - when? don't know. Many of the interesting tech advancements, starting with live view have been working to get us away from the OVF, e.g. remote LCD monitors, tethers to computers, control from iPhones, etc. If we learn anything from the history of tech advancement - mechanical devices will (almost always) be replaced by electronic ones. Just a question of time.
SLR cameras have gone from being 99% mechanical devices (film) to maybe 90+% electronic (digital) without this much hand wringing or consternation - digital just got good enough, so we changed. It's this last step, changing from OVF with (often) excellent focusing screens to EVFs (at a time when OVFs and focusing screens are getting worse IMO) is causing so much heartache. Change can be difficult, but it is inevitable. I do agree that the change will no doubt be gradual - people will get the mirrorless 5De to go with their regular DSLR, but will eventually leave that at home. Not unlike the change from film to digital - their will be a tipping point that will seem like overnight.