People get stabbed with screwdrivers, (I worked with a chap who was stabbed in the hand with a normal unsharpened screwdriver) they are blunt. I'm sure this is pure marketing over sense. A solution to which there is no problemI really don't think this will do anything to combat knife crime. More than likely it'll cost too much for Mr Joe Average so normal knives will continue to be made and used.
Its not that bad an idea. It is a bad idea for crime fighting because criminals are not going to buy a knife they cannot stab with if they intend to stab someone.
However I wouldnt mind one myself, ive no use for a sharp point on my knives in the kitched its an unnessisary hazard, ive cut myself a couple of times and all I need them for is slicing.