I went a few years without, everyonce in a while I get on a poptart kick. I've got a box in the pantry, I haven't noticed any size changes. Could be wrong.
Lots of times the manuf will change the amount of stuff in the package. Usually they start this with a '20% free' type promotion which is generally the size of the package up until the latest downsizing. Then they ship the new smaller boxes at the same price the old boxes were. Now you are paying more for the same thing and you probably didn't notice the switch.
My favorite item price gouging was on saltine crackers. The smaller size box (half size) cost MORE than the big size box. Not per oz, the actual small item cost about .10-.15 more than the larger box.
Old folks bought the small box so there'd be less waste, or maybe because it fit better in their condo cabinets but regardless, they paid more for less.
I always wanted to see a big red sign on something that said 2 for the price 3. I'm sure people would not even notice.