This seems like an opportunity, actually. If Outerras Osm implementation along with other databases can provide cities and airports that match FSX/X-plane locations, then I can easily see sim-pilots, maybe even some professional simulation companies, adding Outerra to their repertoire.
The question is, are the devs positioned for, or capable of (resource-wise) taking advantage of something like that.
And are they interested.
If I was a third party company looking for a market, I might consider taking a look at this as well, honestly, and working with the devs to see what could be done.