That may be true in North America but I don't think that it holds true around the globe.

I can think of a few McDonalds which really only get business as they are convenient rest stops based on their bathrooms. The ones in Himalchal Pradesh and Uttar Pradesh come to mind. The one in the Getreidegasse has been there for decades, and while it may be a destination for Americans, I know locals who will use it as a pit stop only.

It's a chilly weekend in central Europe, and the local mall where I am this week was crowded. On the upper level (cannot call it a food court), every eatery had people seated and waiting, from Lebanese to sushi to Indian to German seafood. Only the McDonalds had one or two customers at a time. Outside in the pedestrian zone there was not a single customer at the McCafe window, while the local coffee houses were full.

The McDonalds at MUC doesn't seem to do a roaring business, and I doubt that the other eateries are that concerned about losing business to them. I often have to wait a very long time at the local Turkish fast food at MUC, and that for instance hasn't changed since McDonalds took over from Burger King.