MS Flight was doomed from the beginning when they tried to make a game out of it. Hawaii is nice, but flight sims have been growing more towards being able to handle the whole world for a long time, so getting just the islands is like flying in a prison. A nice prison, but a prison nonetheless.
Blade Element Theory does make for a more nimble FDM, but for most practical flying, I've come to realize that it's not essential. If it were, all of the professional flight simulators everywhere would be using it, and that's just not the case. X-Plane benefits from BET in that it makes it possible to design your own unique aircraft planform and have it fly realistically. I've done that with GrizzlyJet, a VLJ bush jet that I use in my homebuilt cockpit. Once I'm really happy with the way the bird flies, there are scads of analytical possibilities offered by X-Plane that should allow me to extract the JSBSim data. It might even be possible to do that with an X-Plane plugin, and I've got a bit of experience there. That would make X-Plane a partner to Anteworld in some ways.
You saw Ben's post, did you? Funny one. He's a good dude, but I can understand the frustration of being badgered with someone else's work. And I have to admit, I've chimed in with a bit of political control myself since I sympathized. After all, if X-Plane adopted Outerra, a LOT of effort would go down the tubes. But now I've seen that Outerra has the potential to provide a more stimulating environment. X-Plane just looks so dated, especially at altitude.
Right now X-Plane is, if I'm not mistaken, the only closed-source flight simulator on the market. In the past few days, I've seen that other options are definitely nipping at their heels. And if you can keep Outerra/Anteworld moving forward, Brano, you'll be near the head of the pack yourself.