Speed and Reliablity
The big problem with a switch from CF to SD would be speed. The fastest I have seen a SD card in 133x but we know have 300x for CF. When your are taking 6 10mb pictures every second or more you need that extra speed.
As for the hard drives the crash a lot and would not be as secure, you would have somebody loose all their data because their hard drive failed. If we were to start seeing internal memory it would be using the same flash memory that is in a memory card of flash drive.
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