one other thing to point out (because I haven't seen it brought up yet) with regards to LCD vs. Optical View Finder:
Unless you're using a tripod, composing by use of LCD vs. viewfinder is inherently less stable. It is much more stable to have the camera pressed up to your face.
On an ancillary point - think of panning with just LCD & how much more unstable that would be.
I beleive we'll get to a point where both will be offered on DSLRs (like both are offered on better digicams) but live view won't replace optical. Even if they can eliminate all the other negatives regarding live view - the stable platform for shooting would still not be addressed.
Many cameras have eyelevel ELV finers so that is not an issue and as the refresh rate improves it will be even better