To try and to fail
... is better than to not try at all.
The main government driver for almost everything (apart from personal gain: political or financial) is CYA. Therefore it's not important whether a programme succeeds or fails - if it's timed properly, that will be the next incumbent's problem - but to be seen to be doing something. To show that there is action being taken. That there is a policy.
So it is with this one, too. Who cares if it won't work or costs too much? Most government IT projects don't work, so the only issue is to manage expectations: downwards. As to cost -no big deal! The money's going to be spent on something, somewhere and whatever it's spent on probably won't deliver what was intended, anyway.