When Amarillo loses a restaurant there are usually reasons. There can be a lack of people knowing about them. It could be that the owners retire and move on. Maybe the food wasn't that good. There are reasons though.
I was driving around Amarillo, like I do a lot when I noticed this. Normally when I drive down Olsen/Paramount everything is status quo. At least it has been for a while. I noticed some activity recently that was unexpected.