Is it just me or are 2 different arguments going? One seems to be about the quality of PPL navigation and the other about keeping people flying in GA.
Personally I think the real 'enemy' of GA is the weather, and you can't do anything about that!
On the flying / boating front, I used to own a sports cruiser 26ft LOA, so not the biggest thing afloat and the very reason I ahven't bought a share in an a/c is down to how much money I lost on the bl**dy boat!
There are 2 good days in boat ownership, the day you buy it and the day you sell it! I'm willing to bet the same applies to a/c ownership