I visit this site at least once a month and every time it picks me as 'unique'. That is because each time i've either installed a plugin, installed a font, my browser version changes every 5 days with automatic updates, installed a new browser, installed a different browser, am using multiple browsers, am accessing from my phone, ipad, work computer, etc.
This makes it useless for actually tracking people.
To make browser fingerprinting anything more than useless in tracking you need an algorithm that fingerprints but doesn't capture everything - such as how hardware-locked licensing works and Windows Genuine Advantage - you can change your soundcard or any minor device and your overall ID/fingerprint is still the same (i'm struggling to remember what this technique is called).
When reading the NSA revelations I dug through everything with an eye on wanting to know if they used browser or machine fingerprints to track users. They don't. There is enough unique information in IP address, cookies and email accounts alone.
And I bet most people who are concerned by tacking online and impressive demos like this are still using their real IP address online, still accepting cookies, etc.