“Look at the boneyard on Las Vegas Boulevard — signs for places that thought they'd always be lit.”
3 sources: latimes.com, neonmuseum.org, wikipedia.org. The Neon Museum’s Neon Boneyard on Las Vegas Boulevard holds more than 250 retired signs, including signs from historic hotels, casinos, and other businesses. The line about those places thinking they’d “always be lit” is figurative, but the underlying description is accurate.
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The Neon Boneyard | The Neon Museum Las VegasHow Many of the Signs Light Up?
Neon Boneyard - Neon Signs in Las Vegas | The Neon Museum