@AC - free parking
Er, we have that in my town. Not exactly a shopping Mecca, but people use it. (It's got a vile 1970's concrete abomination squatting in the centre of town, crushing all chance of the place having any character or soul, and the shops are a heady mix of charity shops, pound/discount stores and nail/hair bars, giving everyone a very good reason to go anywhere else)
But people still abuse the blue badge scheme, just to get 3 feet closer to the shops, so they don't have to make their poor long suffering overweight offspring waddle too far between the SUV and Thorntons.
Of course, a database is a total waste of time - what do they think the existing scheme is? At a glance, it's a list of people who are entitled to blue badges, renewal dates and so on. Looks like a database to me...
Free parking won't help at all in most places (some would benefit), and a new database is even more pointless. Only enforcement will do the job, and that means having wardens check that anyone using a blue badge space is definitely disabled (i.e. not just carrying a badge)