People should stop trying to see the sim as a final product.
The sim is just
a platform, on which you are meant to install addons.
It's not MS's task to make everyplace on earth look beautifull and detailled. MS's task is to develop a system that allows any developper to create sceneries as easilly and precisely as he wants. That system includes a big variety of landclasses, the ability to read and display high resolution meshes and ground textures, the ability to read and display high amounts of autogen objects etc... Thanks to this system, you were able to get OrbX-style sceneries, or ultra-precise photosceneries, and other things that cannot even exist in previous versions of the sim.
It's not MS's task to provide Accusim-like airplanes. MS's task is to develop a system and an API that allow plane creators to simulate anything they want. This system includes various features like animations, flight model handling, APIs for communication with external programes, SDK, etc... Thanks to this system, you could get new airplanes with unmatched level of details and realism (VRS + soon TacPac , Accusim aircrafts, PMDG etc...) with again, stuff that could not even be imagined on previous sim versions.
What MS includes in the sim is pure bonus to start with, to help you discover the new sim, that's all. Default SABA suck just like 99% of the airports on the virtual earth, that's a fact. Another fact is that MS has created the sim in such a way that you can replace them.
Finally, when it comes to the amount of CPU power that will be required to run Flight, or XPlane10, or even the amount of money required to run FSX after the SP2, it's always the same story. If people would stop trying to push the settings to the max, they could get some nice performances and "nice-enough" visuals. How many times could we read complains like "
if it doesn't run on max settings, then it sucks" ? How smart is that ? How many people actually tried to set the FSX settings on the same level of details than FS9 ?
Yes, you will probably need a 10 000$ computer to run Flight or XPlane10 on max settings at more than 10 FPS... Or you can just keep your 1000$ computer (or less, if you don't change the screen, keyboard, mouse, speakers, joysticks and I don't know what else again) and set the game settings a bit more wisely, trying to focus on the feaures instead of the visuals