I wonder if the number of people interested in hockey in the Vegas desert is the same as in the desert around Phoenix.
The IHL's Thunder used to have a huge following back in their heyday, and the ECHL Wranglers still have one (despite the current issues).
Let's say that Vegas gets a team. Here's where all of the uniquely Vegas variables come into play.
1)
Tourists. If someone wants to see a show or a concert involving a specific act, there are plenty of times to see what's basically the same thing. Cirque du Soleil's Tuesday show is the same as the Monday show, Blue Man Group is the same on Saturday as Thursday, and so on. But there may be only one chance in seven days to see an NHL game. If there are tickets to see two shows and an NHL game, that game is getting watched.
2)
Fans. Vegas has 20+ years of pro hockey with a passionate following, in addition to their usual NHL preseason games that sell out as well.
3)
Wagering. Regardless of what the NHL does in regards to gambling on the sport in Vegas, it will cause a huge surge in interest because it will either be a taboo subject with underground wagering or something local that everyone gets in on. And then the local team isn't the only one being watched...imagine a casino sportsbook full of guys awake well past midnight watching the Oilers and Canucks in their snoozefests.
4)
Turnover. This week's population is entirely different from last week's. Last week's was different than the week prior. Every week there's an exodus of a good chunk of the population and an influx of a new part.
5)
Residual distant benefits. Give tickets to a tourist. Make sure they go to the game. That tourist goes back home and watches their local team. That tourist is hooked and becomes a fan. Even if they never go back to Vegas again, the NHL and hockey as a whole now benefit.