It’s a proven fact that these restaurants will stop offering/selling these items if the customers stop buying them.
Has that restaurant STOPPED offering the full size salad and sandwich? If not, then your example, fine as it is, does not provide proof of SJSAMPLE's assertion.
May I make a suggestion? A nice cup of tea?
I was responding to YOU, not SJSample.
One of the fast food restaurants in town offered a gigantic burger for a while. It didn’t go over well, so they stopped. I am sure that you have some concept of proof that precludes my anecdote, so I’ll go talk with someone not quite so obsessed.