No different than launching sports on a poorly performing AM. Of course, most of the decent signal sports launches have worked as there is an audience for that.
The thing I look for when starting a new format is unified listener passion. If you find something that unites a large group of people in a passionate way, it will work as a radio format. Right now, that's sports. I was just looking at the trending topics right now on Twitter, and most of them had to do with sports. Of course, we have a lot of great sports events now, with the NBA playoffs and baseball. But I often look at trending topics on Twitter for an idea of what people are talking about.