Why bother?
If the EU spent half the amount of time and money on trying to find solutions to the problems that cause third-world poor people to want to find better lives in rich countries instead of trying to create ever more imaginative ways of playing with their big boy toys, perhaps we could stop wasting all of this taxpayers money.
In any case, I still fail to see why biometrics are necessary for a system to record people's entries to and exits from a country. I've been to many third-world countries where passenger entries and exits are recorded quickly and effeciently into a computer system linked to a central database from a simple scan of a machine-readable passport. If these countries can create successful exit/entry recording systems, why has it taken the EU this long to even propose it?
Cynics might even question the motives of those in their ivory towers who wish catalogue, cross-reference and generally categorise us like museum exhibits. Fingerprints, facial scans, et al are quite frankly nothing more than unnecessary distractions and completely and utterly unnecessary.