Thanks for the reassurance. I will eventually move over to P3D but I will also keep FSX SE installed. Moving over to P3D isn't as simple as moving from FS2004 to FSX. The system requirements for FSX and P3D v4 was very significant and it requires a bit of an investment for those with a limited budget.
That being said, in the next 3-5 years I can easily see P3D dominating the market along with XP11.