I don't think DSLR's will die suddenly but one has to consider the benefits that mirrorless systems offer over a conventional DSLR.
Some of these features are really must have for me now, most also take the stress out of photographing key moments which in turn can result in time and effort saved.
- Eye-AF
- Face Recognition
- Focus Peaking
- WYSIWYG
- Silent Shutter
- Size & Weight
- Less moving parts
- Better AF point spreads
It just makes life easier compared to a DSLR, yes the end result in terms of photo output might be the same, but which system was the easier of the two to get to that result?