There are developers out there whom we won't mention who are going to continue supporting FS9 as long as they have paying customers.
They don't spend much time doing an FS9 version, because in most cases they are still really making FS9 sceneries, ported to FSX.
We are now so far away, not just from the FS9 way of making sceneries, but even from the FSX SDK itself (because of all the additional things we do in FSX with our software modules), that making a scenery for FS9 is quite complex, so the tiny minority of FS9 users no longer justify the extra time spent to do an FS9 version.
Rather than going back to FS9, we would rather doing something for X-Plane, and that is saying something, because we don't have any plans for X-Plane either...