In Texas we now only have to display one sticker--the windshield registration. But you can't renew your registration without your car first passing its annual inspection. The inspection system automatically informs the registration system once the vehicle has passed. It is one less sticker to gunk up the windshield, and nothing need be attached to the license plate.
As to how much money that has cost/saved Texas taxpayers...well, I'm too lazy to Google it