The brand changes, but customers don't know it until your Breyer's ice cream has a label that says it's "frozen dairy dessert product", or your Twinkies are 10% smaller, or your Pyrex glass pans start shattering. Then you wonder what happened to your beloved childhood / family brand you trusted.
Capitalism is what happened. But things come and go, and hopefully newer, better things will take their place.
(By the way, the story of what happened to Twinkies is more interesting, and not just the negative story of a company cheapening out its product for profit's sake. There was a lot of dysfunction/waste in that product line.)