Think of it this way. It sounds like you're surprised by the number of new cars being purchased, but presumably you're not surprised that people are constantly buying used cars. And yet, roughly every used car that's purchased corresponds to a new car being purchased, unless you're expecting total car ownership to decline.
The lifespan of the average car sold today is significantly longer than in the past. A new car can be sold as a used car several times before it ends up being recycled. I don't think it follows that there is a 1:1 ratio of used to new car sales.
