I really don't get your point here. Yes I am obviously one of the cars each Saturday at Appalachia. But in 2012 I'd be 1 of say 40 cars on a SAT AM (my "normal" if you want to describe it that way), then 1 of 45 a year later, 1 of 56, 1 of 72 and 1 of 90 cars now. For the same time on the same day of the week at the same time of the year the amount of cars in the lot has grown substantially. There are clearly many more cars parked at trail heads now compared to when I first started hiking. Whether or not my "sample" reflects the latest blip in a long up trend, a reversal of a decade long decline, etc I have no idea. All I know is that it has grown dramatically in the last 6 years and I see the impact on trail conditions.
For not getting my point, you described it well, just go backwards in time. I started hiking seriously in 2001. So, I was car 1 of 30. To everyone before me, I was adding to the volume. To me, 30 cars was 'normal'. For everyone after me, they are driving up the volume.