More on ESP......
MSFS 'could' still sell ESP as a secondary platform. If they sold it for $200.00 a copy as a 'EULA' edition for such groups as flight schools and colleges, I think they (MS) would sell quite a large number.
I would change the startup screens though, not keep them the same. As a matter of fact, if Aces still had their team in their, they could have requested agreements from firms like Cirrus and made all trainers for the sim, (add 3 famous trainers, jobbing them out, installing them into the ESP platform).
This way, flight schools still get their ground school software, at an affordable price, and MS / Aces would have made good money from flight schools through out the world.
Then, keep a seperate department that would be strictly contracted only, as like MS does for businesses that need business tailored software and OS systems.
In my opinion, there is still life for it, but on a much more affordable and reasonable 'playing field' or market. Selling 10 to 100 copies at $800.00+ is nothing compared to selling 2,000 copies at $200.00 each.
Plus, if you had many more planes to fly in it, many people in the 'common' market would have been jumping in to buy it. No one could at $800.00+ a copy, (young kids, students, parents with families, etc). I think $200.00 would have been more feasable.
This is my humble opinion, with a viewpoint based here in the common real world.
Bill
EDIT: and I would change the name... Something cool... Something about flying. ESP makes me think of colleges doing tests on peoples ability to read minds. Flight Simulator Expansion Pack, or Flight Simulator Universe, or Flight Simulator Ultimate would I think be more marketable. Again, my own humble opinion...