I can't imagine it being a short-term craze just because of the conveniences ereaders offer. For myself, I have a double whammy. I have almost reached the magical age of 50

and need reading glasses and really good light to read a book. Also I have type II diabetes (not controlled as well as it should be at the moment) and my vision goes blurry at times because of that.
For me, it is so much easier to read from either my NC or my Nook Touch--I will never give up on ereading!
Mary