For example, people did not go from buying 1 car to buying 10 cars and then 100 cars - most of us hit saturation somewhere between 1 and 2, and stayed there. Similarly, the average speed of our cars did not increase at an increasing rate except in the earliest years of automotive technology; we have a "highway maximum" between 50 and 70 MPH, and a "technical maximum" in the high 200's range for production cars which do not rely on rockets or other not street-legal tricks (a quick search brings up the Hennessey Venom GT at 270.49 MPH). Likewise applied to fast moving vehicles as a whole, including supersonic aircraft and rockets, we've already brushed up against vehicle weight and power density limits that slow the rate of improvement in acceleration.
Applied to the Moore's Law measures, that indicates we have a "endless sunset" period ahead of us where we'll still get more doublings of semiconductors, but they'll come increasingly slowly as more fundamental innovations become necessary to realize them.
What we don't know is whether there is a logistic curve on technology as a whole. Belief in the Singularity is premised on this not being the case.