$200 a barrel oil affects EVERYONE in aviation, regardless of employer. Netjets owners, while better able to weather high fuel prices than most, can reach a price point where their behavior will be affected. Some may not be able to keep flying on their share, some may reduce their flying somewhat, some may shift to a smaller and less expensive aircraft, while others won't give a rip and will keep on trucking as before. The inherent advantage of an organization as large as Netjets is the ability to smooth the peaks and valleys of demand across a large group.
To me, the far greater long-term threat (and one that is closely related to fuel price), is the anti-capitalist, Chicken Little, global warming crowd. The more people they convince that fossil-fuel is destroying the planet, the more pressure there will be to restrict the discovery, extraction, refinement, and use of petroleum fuels. Anytime you restrict supply and create scarcity, the higher the price. And don't kid yourself: there is NO ALTERNATIVE FUEL in existence or on the horizon with the required energy density to be practical on board an aircraft. There are efforts underway to create jet fuel from sources other than crude oil but they closely mimic Jet-A kerosene and offer a very similar carbon footprint and are therefore destructive in the eyes of environmental activists.
Accurate science and facts be damned, Al Gore and his bunch will continue this charade until we're all riding bicycles and every country on the planet has the same standard of living as say, Burma, or Sudan.