Chicago is as close to the Quad Cities as Des Moines is. Cedar Rapids/Iowa City are two hours away from Des Moines and their sports entertainment options are dominated by the Iowa Hawkeyes. People aren't driving hours to Des Moines to watch a G-League team play.Des Moines is the largest city and capital of Iowa. Which El Paso is neither of Texas. Des Moines is the epicenter of entertainment for Iowans.
What makes you think El Pasoans would support an AHL team?
Perhaps Des Moines gets the biggest concerts in its region (although the concerts I attended were in Cedar Rapids and Waterloo), but if Des Moines is the biggest draw for its region, that's what El Paso should aspire to be. El Paso should have the arena with the biggest concerts to draw people from New Mexico and Juárez.
Des Moines does have competition for entertainment; eastern Iowa has Chicago and northern Iowa has Minneapolis. Wisconsin Dells draws people away during the summer.
I think El Paso would embrace an AHL team because they have embraced the AAA Chihuahuas and the USL Locomotive, which are in comparable leagues in their sports' hierarchies. AHL teams are NHL affiliates and some players will rotate between the AHL and NHL team. It's a higher level of play. But hockey is a cold weather sport, so it's certainly possible it wouldn't take hold in El Paso.