Just don’t click it.
This was a very interesting experiment for me since I seem to be developing some tendenitis in my right forefinger I use for clicking. A web-design interface with no clicking is appealing, though trying to teach computer-challenged people how to use it might be difficult.
Chasing the Wind 
I gave up the traditional mouse years ago. I found the trackball explorer more friendly to my hand, less painful tendons, etc.
It took about 6 hours of use to get used to moving the ball and clicking with your thumb.
I don’t think programs like Autocad could live without the click. Even without the click, we are all still going to be inputting text with keyboards.
Cheers.
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I confess, I miss the click. Well…it’s not that I miss the click, but that I find the screen changing when I simply move over an option really, really annoying.
The “swirly select” wasn’t bad but I could see it causing wrist pain after a while.
I started getting bad tendonitis in my forefinger as well; I finally figured out it was the trackwheel.
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