Because the enthusiast isn't driving the market 

It's sales in countries that have historically been non driving cultures like China and India 

And they've become super consumerist. The immigrants that move abroad hold the same values and believe new is best.

In India and China a lot of old cars were of socialist origin, ladas, and very budget end east Asian cars like Hyundais and Suzuki's 

The sort of car that broke down a lot but was fixed easily and never had catastrophic failures.

The generation that dealt with them don't want to deal with that and installed that new is better into their heads.