Like, they’ll keep making them, or like, the ones that were first made won’t decompose because of all the preservatives? 
So is mine.
I had just turned 15, so I clearly remember when McDonald’s didn’t sell Big Macs. The few times we went to them, it was just the regular hamburgers.
There was a local drive in restaurant in my neighborhood called Mac’s who had a burger called the “Big Mac” in the late fifties. It was a great burger! When McDonald’s went nationwide with their Big Mac, the owner sued and got a very generous out of court settlement.
He used the money to remodel the restaurant, turned the place over to his kids to run and retired. The place was out of business in three years.