The answer to the thread question is no, in my opinion. I don’t know of anyone who is craving a foldable iPhone. I’ve handled the one created by Samsung and it was a nice, but thick device, but it didn’t appeal to me or caused me to want to purchase it.
I do not have any interest in a foldable iPhone. That said, if Apple has one on the drawing board, then I think they would be wise to take as long as possible to Mae sure it works fine… even if it takes three years.