Sure there are a lot of bandwagon fans in Nashville. But it is a different type of bandwagon.
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Hockey is at least the 4th most popular professional sports in the United States, and I'd probably rank it behind Auto Racing too. There just aren't a lot of people who grew up hockey fans. So most people don't have a team.
I've lived in Nashville just over 10 years. I've been going to at least 1 Preds game a year since then. I'm by no means a super fan like I am a Kentucky fan (since I grew up in Kentucky).
People in Nashville (and surrounding areas) are just looking for a team to support. Most of them have never had a favorite hockey team. The "bad" bandwagon fan, IMO, is someone who was a Penguins fan last year, and now is a Predators fan (or a better comparison is someone who is a Yankees fan, a Cowboys fan and Warriors fan).