As I said how many people will fly from Europe 5 hours on a 737 to go on a LR/ULR trip after.
There are simply a lot of places a widebody cant go that a 737 can go, or doesnt have the demand of a widebody. Thats what makes the tie up so attractive between EK and FZ, I dont think we will ever see a full merger, but there will be closer and closer working togther. The Max interior is way better than the NG interior and that was supposed to bridge the gap between EK standards and a "hybrid/LCC" standards, but of course the grounding of the Max etc didnt help with that. There is also talk of FZ getting a few dedicated freighters which will also help open up new cargo options..