The Arizona model cost $30 million to construct, so maybe a smaller scale one in Twin Falls would be more realistic. While many residents wouldn't be very welcoming to the increase in tourist traffic, the city already draws thousands of visitors a year to Shoshone Falls and the Perrine Bridge.
According to the site history, some guy looking for access to a geothermal pool created the geyser on accident after he drilled into the spot more than 80 years ago.
The most common complaint I hear when people come to visit is Craters of the Moon. I've been a few times and agree. Craters is my definition of a tourist trap.