While most of the aviation "security" measures introduced since 2001 have been absolute bull****, this is probably the first measure I've heard of that at face value looks sensible.
Looks like we're going a step further than the US though; they only do fingerprint scans on the way into the country, and even then certain classes of people are exempt (diplomatic visas etc.) You don't even see a customs officer on the way out of the USA.