So if all of the iMacs are going to be 'captive' in a canned 'demo mode', it will remove a major focus of 'foot traffic' by people stopping to use the demo macs.
When traveling, I've stopped in many times at the local Apple Store to check my email, or even check for accommodations for the next leg of a trip, checked flight status, checked weather, and made quite a number of impulse purchases of chargers, cables, cases, batteries, etc...
And, for some reason, I find the idea that people would confuse the 'smart signs' for iPad demo units rather sad and hilarious. In my mind, it shows, perhaps, the versatility of the iPad.
There are changes afoot at the Apple Store, the 'Center of the Universe' for a very large number of people. Removing a large amount of the 'foot traffic' is going to kill the cachet of the Apple Store. If there is no difference between the Apple Stores and a Target, or a Best Buy, people are going to be ditching the Apple Stores, and ending a large part of the 'religion' of the Stores...
Apple is gradually losing its 'cool', its 'mojo', it's 'heart'... It's 'youth'?