Well, going based on what I've seen come to light in the last months I'm real optimistic of new breakthroughs. Proptrash started the venture, Bill ran with it and last I knew was digging deep into it in a real positive direction. Based on what Bill has shown us this far my eyes are open wide in lou of a positive outcome as it's soon to be right in front of our eyes to see for ourselves.
...As for FSX, currently I'm in the dark with anything but a lack lustre experience. Granted FSX has it's advantages over the older sim all the way round but, those that fly FSX exclusively are, and will be eventually at a stalemate like the earlier. When that time comes no one knows. MS Flight is right around the corner. Who knows how many will take that ride to start the process all over again. I surely won't.
IMO, I see FS2004 already proven. People know what to expect at full sliders. The developers left it. Not the simmers who see the strength in whats obviously still there. And, there's no need to constantly play the upgrade game because FS9 is already set in stone. And that mold may get refined. Who knows.