Here is some potential good news for SLC. I have friends that live in Norway. One of which works for Norwegian Air Shuttle. The airline is in the process of adding, building, and growing their United States presence. They already fly to or have plans to serve Orlando, Los Angeles, Oakland, New York, and Ft. Lauderdale, in the U.S.
With that she told me the following which is that Norwegian Air Shuttle is studying and looking into adding Salt Lake City by maybe spring or summer 2015. They have their main long haul hubs in Oslo, Copenhagen, Stockholm, and London-Gatwick. She said if service is added to SLC, that two or possibly three of the hub cities would offer nonstop flights to SLC using their 787.
Here is their website if you want to learn more about them.
http://www.norwegian.com/us/