If there indeed was a drop in business it will be short term - people will get used to the paid parking.  I think they should revisit the rates charged in that more stores should provide a stamp for a reduction in the parking fees for those who are shopping legitimately (and for a certain value of purchases) - it encourages shoppers to come to City Centre, spend in those stores, etc.

I enjoy the availability of parking spaces now - but then, I actually go to malls to shop - so many people seem to use them as a free form of entertainment (i.e. window shopping).  Getting rid of those who abused the free parking was a good idea - they just need to fine tune it.  The theater and Carrefour are providing a "discount" on purchases - more shops need to follow suit.