Some things do not seem to change. Among them: the high end of U.S. Internet access service speeds roughly double every year. That implies an increase of an order of magnitude about every five years.
If you assume access speeds (for lead users) are somewhere north of 100 Mbps now, they will be in excess of a gigabit in five years. In a growing number of U.S. local markets, typical offers for consumers already have reached a gigabit.
But what about average speeds, for typical users? By some estimates, including those of the U.S. Federal Communications Commission, average Internet access speeds increased 300 percent in the last five years (2011 to 2016).