This is very contrary to my experience. I suspect the vast majority of people who learn piano do so with the desire to play classical music, because frankly that's the main thing it's good for. Playing piano arrangements of pop songs is a cool party trick the first few times, but loses its lustre pretty quickly (they end up all sounding similar); for composition there are probably better options in the age of computer sequencers, and fundamentally most people aren't in a position to get much value out of doing original composition.
