clientele of rumoured a850?

I do not want to offend anyone, but I can't see the clientele of the rumoured a850. Why would anyone choose the a850 over a camera like the Nikon d300s or the a900.

For me the clientele for the a850 would have been the average (high) amateur. In my opinion a high amateur or a semi-professional would rather choose the a900 (5fps).

So I would like to compare the a850 against the Nikon d300s, as I expect a similar price point.

Nikon D300s advantages:
+ class leading AF-system with a lot of off centred AF points (cross sensors)
+ 7fps
+ built in flash
+ live view
+ virtual horizon (I would personally like this feature in a future alpha :-))

+ dual slot storage media with options to manage how the camera records data to them
(+ hd video -> as I don't think that this is necessary in a dslr)

Sony alpha 850:
+ FF 24MP

But does a amateur photographer need 24MP of image data, as a 12MP image is far enough to make decent enlargements up to 17”x22”.

But please convince me, as I love my lenses. I would like to love the a850 or whatever comes after that, but I can't see the point right now.