if some people are excited about a new camera, no need to pour cold water.
Whether true or not, comments like "it won't help you take better photos" are uncalled for.
Besides, that statement is completely right anyway.
Whereas creativity, a photographic eye, the drive to search out the best times and locations for the winning shot are independent of the camera used,
the TECHNOLOGICAL breakthroughs do help the photographer capture those shots. So in a way, a better camera can help you take better pictures.
The 'skill' of creativity may in fact be separate from the technical skill of handling a camera. An expert from the days of manual exposure/focus may be able to capture a shot, but not necessarily be creative. Likewise a photographer who depends heavily on auto AF/esposure/flash etc, can still be creative.
Faster AF (low light, speedy, accurate, no hunting), higher ISO sensitivity, greater resolution, live view, dust reduction, bigger, brighter viewfinders, resistance to rain and dust, ability to display those images via HDMI on hi-def TV and so forth.... just help him do the job better. What's there not to desire? I liken it to cars. A good driver delivers his passengers quickly and safely to destination. But automatic gears, power steering, power brakes, ABS, etc, help all drivers better 'deliver the goods'. Automation merely make the technical barriers less of an issue.
Personally, I very much look forward to a 5D Mk II, and would buy it.
Unless of course I already own a 5D or bought one recently, then I would rationalise to myself that a new MkII won't make a difference to me...