I wouldn’t be worried about this, and the answer is exactly what we are able to provide as developers: MODS/ADD-ONS.
Case in point: Skyrim, which has been released 10 years ago, and it’s a game with one of the largest availability of add-ons, and not just on PC, but on consoles too, and it’s still very well alive and kicking to this day. Fallout is not too different.
And guess what, Microsoft just spent an huge amount of money to buy Bethesda, and I’m fairly sure they wouldn’t have done that if those were “just games” with a limited timespan.
The thing is, creating an open world game, like Skyrim, Fallout, but also GTA, Elite Dangerous, Cyberpunk AND ALSO MSFS 2020 ( which IS an open world game after all ) is now really a 10-years process of continuous refinement, because these games are simply too complex and full of multiple systems interacting with each other, that’s it’s impossible to fix all issues during the normal development cycle and/or possibly a couple of patches along the way.
Of course, developing something for 10 years requires a lot of money so, either the game will use a subscription model ( some have done that quite successfully, like WOW or EVE Online ), or it should come with a Marketplace that can provide extra income to keep the servers running and support the addition of new features.
As we all know, the whole MSFS developers community has the potential to be even bigger than the ones of other games ( as far as I know, very few do Skyrim mods as a full time job, if any ), because even if maybe the number of users might not be as high, they tend to spend more.
The biggest challenges here are:
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Find new users. I’m sure the Xbox version will achieve that, provided there will be enough Xbox to buy for the holiday season.
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Keep those new users engaged, so they will be more willing to spend money on the Marketplace.
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Don’t leave the SDK underdeveloped. A proper SDK, with a proper documentation, that allows exploiting all the full potential of the underlying engine, without using unnecessary hacks and strange workarounds, will allow better and more reliable add-ons and THIS is what will keep all users (PC and console) engaged in the long run.