IMO, as long as they make it so you can use your own scenery in place of the dedicated server, that would solve the problem entirely -- unless, of course, the weather system, traffic system, and other parts of the simulation similarly require the central server to operate. Hell, if they just offered a basic, low quality global scenery for those who want to play offline, that would be enough. It would just be standard flight simulator with the option of added scenery fidelity. At that point I imagine you could then just buy OrbX scenery if you really want beautiful scenery. Scenery in a flight simulation is nice to have, but it is no way the focus of a simulation. Performance of the aircraft and procedure is.
For the record, I love scenery and it is definitely an attractive part of a simulator: ie choosing Xplane over Flightgear, but that does not negate the point that simulation is part that matters most. The graphics is just superficial, and appreciated where existent.
Keeping the simulator in a state where dependence on a server is not necessary is all I want. This would also be the perfect end-of-life plan too. Server gets killed? Cool, I can still use my state-of-the-art simulation with basic or even third-party created scenery I purchased and is located on my local drive.
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Additionally, and with no real intent to stir the conversation completely off-topic, Ross Scott (the creator of Freeman's Mind) created a video explaining why the games-as-a-service model is ultimately bad for consumers in the long run, and explains bits of the legal landscape for those affected based on nationality.
It is long, but worth the watch to understand why this business model is bad for all of us if not downright predatory. It's too big of an issue not to speak up about.