I think that SLRs, like everything else, will eventually die, being replaced by the next thing... when and how this will happen, only time will tell!
I think mirrorless is the first step, and the fact that a lot of the P&S cameras are getting better and better!
Yes, but even if P&S reach SLR in terms of IQ, noise and ISO performance, we will not have the same DOF using small sensors....
You can safely assume majority of camera owners don't even know what is DOF.
Let alone the Circle of Confusion around it. Pun Intended. 
anyone knows what DOF means - something to do with the Department of Freedom
getting back to topic, yes, dSLR are dead! anyone buying them right now will realize that their bodies will be useless and as they got old things don't function as they used to. As bodies age, they will notice stuff sagging, pants being to small, and needing larger underwear.
I would definitely stick with the point and shoot cameras. They fit nicely in your pants. Small is always good!