The problem with the monorail is that it was designed as spectacle, not as transit, yet even as spectacle it fails because it's so out of the way that most people never even stumble across it, and if you do take it, all you see are the backs of hotels. It's even priced as spectacle. $2.75 gets you anywhere in New York City via the subway and bus, but it costs $5 to take the monorail just to go 4 miles along the backs of casinos in Las Vegas.
The monorail should have been built in the middle of the Strip. The Strip is a dystopian nightmare highway bifurcating one of the most walked streets in the United States. It's so dangerous that in many places there aren't even any at-grade pedestrian crossings; you have to go up stairs/escalators set back from the strip, go across a bridge, and then back down, often being forced to detour through one or two casinos in the process. It's the ultimate triumph of automobiles over people for no goddamn reason at all.
The mass transit should have been run right down the middle of the Strip. Instead it was forced to the margins where it remains unused, when it was really the car traffic that should have been forced to the margins. Las Vegas should do a NYC-style "Summer Streets" a few times per year and entirely close down the Strip to car traffic for half a day and let pedestrians use it as they'd like, like Mardi Gras. Then people would realize what they've been missing.