The state of the available GA fleet leaves a lot to be desired. The planes which are marginally affordable by the Average Joe are closing in on 40 or more years old, fully equipped with lots of steam gauges, and useless (or near useless) avionics (LORAN, ADF, etc). We carry more computing power in our pockets than was imaginable at the time the planes were designed, and wonder why the planes can't be equipped with similar devices. Just about any plane that does have glass installed costs more than the average house.
Add to that the ADS-B requirement by 2020, which is going to be expensive, and a lot of people are hesitant to buy. I expect that a lot of the GA fleet will be weeded out because of this.
It also costs a lot of money for training -- I laugh when I hear people say that PPL only takes 35 hours and "only" $10k to achieve -- yes it might be possible for one out of a hundred people to achieve it in that amount of time, but the average person takes a lot longer to achieve it. That's a lot of time and a lot of money to most people.
But rather than focus on the negative, we need to start looking for solutions, to determine what we can do to get the next generation to look up from the pale blue glow of their iDevice and to the brilliant blue skies.
We need the media and politicians to stop demonizing the pilot population and change the notion that GA planes are unsafe when we all know that a 60 year old Cessna is far better maintained than 60% of the automobiles on the road.
We need to change the perception that flying is a rich man's game.
We need our advocacy organizations to actually advocate for us and our rights as pilots and free citizens, rather than selling us more crap which we don't need.