Someday humanity will have retinal implants. For those with enough money, an unlocked pair will allow for the latest in 3D and high definition viewing. The rest of us will have ads.
Eventually, the first aware moment of every born person will be an ad and the last image before death one displaying an idealized snapshot of life. Barcodes burned into the nape of our necks might remain fiction and ironic tattoo art, but every soul will have scores of tiny identification codes and serial numbers scored into the bits and pieces comprising our frame and internal organs.
The richest will have the best stuff, obviously. The poor will shop at the Walmart Ultra-center and refuse the extra warranty.
God bless America.