A Singularity?

One of the beliefs discussed in class is that of the technological singularity, a point at which the machine becomes indistinguishable from humanity. The implications of this are vast; are these machines alive, are they really thinking as we think, ect? However this would go about, I feel that the idea that a singular, recognizable point at which this would occur, perhaps with an invention or innovation, which was expressed in class is unlikely to occur. I feel that it is more likely and reasonable that such changes would occur over a long (relatively) period of time than that they would happen overnight. The idea that computers will suddenly achieve sentience to me seems not well thought out.