Whether things will change when the now talked about 'car park tax' is brought in, we will have to wait and see.
As you rightly say, many 'incidents' occur in car parks. My car was involved in one such incident a few weeks ago, when some boy racer decided that he would reverse out of a parking space at speed before looking. Fortunately, I was present so this young man had no time to do a runner. His attitude was 'so what' until I expressed my views.
Some insurance companies do put investigative teams on some cases regarding car park incidents or hit and runs. The only problem with trying to find the other vehicle can be very time consuming with no guaranteed end results, the innocent victim always seems to end up paying the bill.
There is a scheme already in existence called Safe or something very similar, which guarantees safe protection for parked vehicles, this scheme is usually attached to major shopping areas. One particular scheme in my area that as been running for a number of years now, is very successful. The CCTV system is hooked up to other systems which provides tracking of offenders, in a wide area.