While I do understand that this hype is generated from the show ‘Rick and Morty’, there is still an undeniably large demand for this sauce. There may be some variability to this, but McDonald's currently offers about 18 different sauces. Unless you are a McDonald’s employee, the average joe will not be able to name off even half of those. This is where the Szechuan comes; knowledge. People actually know about this sauce thanks to ‘Rick and Morty’, which is why it has potential to be a goldmine. Right now, the demand and supply for this sauce is so disproportionate, that people are selling this sauce from hundreds to thousands of dollars.
McDonald's is a multi-billion dollar company. It is easy for me to look at this situation from the outside and just say what they should do, but I am sure it is not all that simple. The company probably employs some top notch financial and marketing advisers. I am sure they know what they are doing, but for the life of me, I cannot figure out their reasoning for not bringing back the Szechuan sauce for good.