They will be, it's the reasons for the new postal barcode called the "Intelligent Mail Barcode." (IMB)
The current barcode (Postnet Barcode) cannot be used for tracking, it only has delivery information in it. Every piece of mail to your address has the same barcode, that makes it impossible to tack.
The IMB will have the option of being serial numbered, and tracked through to the destination Post Office. They are not considering scanning at the delivery point, because of the volume of mail (average of 4.7 pieces per stop) that is delivered makes manual scanning impracticable.
Now the real question is will any of the big mailers avail themselves of this feature? Probably not many. BOA might, Citi might, but Netflix won't.
Netflix knows that you only get good scan logs with Confirm service if your pieces are processed on Delivery Point Sequencers, and they also know that most of their mail is not (and almost none of their return mail is). because the mailers are truly non-machinable.
The uncentered disk causes too many jams in the outbound processing, and the return envelope usually folds in half, covering the address. Because of this they have no incentive to pay $25,000.00 per year to find out their discs aren't being scanned, they already know that.
I seem to recall that the OIG wrote to Netflix telling them to redesign or else, but I'm not sure if anything came from it.