I bet there were people like you who thought the same of the first printing press.
"The pen and ink is perfected!"
"How is it productive to print each letter like that? My calligraphy is so much faster and cleaner-looking than that."
Newsflash: Most great things in the world that we have in common use today first started off looking like gimmicks to reasonable people like you. They get improved upon over time and soon you will wonder how you ever got through life without it.
I see your point/logic. I do agree that things get improved over time.
But I still think multi-touch is a gimmick. The ONLY advantage it poses over a regular mouse, is the ability to control multiple points at the same time (with the mouse, you only have one mouse cursor, hence you can only do one task at a time)
ex. clicking the ok button in a window, then opening an item in the dock. with multi-touch you could tap both at the same time, and both operations occur (assuming the developer of that OS is smart

)
So i will give that ONE advantage to multi-touch.
But, still think of the disadvantages (tired arms, inefficient)
Plus the GUI has to be completely designed for multi-touch for it to work well. This makes me partly doubt windows 7, because knowing microsoft they will stick to the old cliche's of the windows OS (start button, task bar, lots of lists ) rather then re-design windows GUI. Dont quote me though... who knows though, I could be completely wrong.
I just think multi-touch isnt worth the hassle its gonna cause (force consumers to buy new hardware) force developers to re-write their softtware, OS's have to be re-designed.
All just for the ability to react with your GUI in multiple ways at the same time?
I hate to sound snobby and throw in an old out-grown quote but it just fits way to well
"Dont fix what isnt broken"