[Klaus]

Not dead but dying. Of course, the transition period will be fairly long - most will not abandon their prior investments just like that and old dogs will stick to their habits, of course.
There's just no conceptual advantage and many disadvantages (mirror slap, less accurate focusing, less focusing options (e.g. no eye-mode), cumbersome movie mode, lens performance penalty, dark viewfinder in DoF preview mode, no live histogram, no live color feedback, dismal manual focusing).