Great question.  How does the concept of having a larger computer doing the mining like the fella in, I think, Iceland, who built this computer that cools from the outside air and all he seems to be doing is mining Bitcoin.  Mining with a GPU doesn't seem like anyone will get very far is your computer is not going to be fast enough, or heat up and not work as fast as a big computer.  Does the whole concept of mining make sense anymore? Just asking, I really don't know.  I imagine for Bitcoin it may be rough but how about the other crypto-currencies?