From the "Doh" file.

The main reason they did it is because all the police cars now have video license plate readers installed that constantly scan every car on the road and actively compare them to the registration database. Since the stickers are now redundant and can also be forged or stolen, no point in having them anymore.

I’m just as happy not having my tax $$ wasted on them anymore.
They have us right by the plates all right.