p.1 #2 · well will you look at that, XQD cards already
Camera makers should just put 8GB of fast flash in the camera and buffer to that. Then they can copy from the internal flash to a removable card at that card's speed. No need for a huge RAM buffer when not forced to bottleneck around some particular standard interface implemented to fit some form factor and power specification. Basically, internal flash to act as a file system journal of sorts for FAT32, but that allows swapping cards. This would also add tons of fault resistance.
p.1 #3 · well will you look at that, XQD cards already
it is unfortunate that all these things require electrical power and that there's only so much of that to go around.
i have little problem shooting in that my D3 w/BUG (buffer upgrade) will buffer 32 raw frames and approx 99 jpg. the D4 will buffer approx 79 raw frames and up to 105 jpg i believe. you have to put it down sometime. i have never lost a frame yet. got way too many i didn't want or need though.