That's right - the privatisation took place
way before 2011.
Also my comments on costs would be exactly the same for any business which charges out its fixed costs divided by the amount of product/service delivered, which arguably it has to in some way. Marginal costing works only until you reach capacity
The airlines apply a lot of noisy pressure to remove what they see as subsidies for GA or whoever.
That said, aviation is a nice gravy train for large numbers of people, and that is yet another thing which holds back progress.
The key factor is that most countries treat aviation as a part of their transport infrastructure. In the UK, this has been separated out, for far longer than I've been flying. That directly leads to the issues which hold back the development of GA.