The Las Vegas casino show scene has been and is prone to this:
The French showgirl revue was introduced to Las Vegas in the 1950s with Lido de Paris, and the style became the default setting for Vegas for years afterward with such shows as Folies Bergere, Hallelujah Hollywood!, and Jubilee! (the only one still performing today, albeit since 1981).
Siegfried and Roy got their start in Vegas performing between showgirl acts in revues, but were so popular they became headliners in the late '70s and proved a magic show format could work. Especially after they opened a gigantic production at the Mirage hotel in 1989, many casinos created their own magic-themed productions, making it the go-to genre of the '90s. Nowadays, it's verging on Deader Than Disco as older productions close and newer ones fail to bring anything new to the table (Criss Angel Believe, a Cirque du Soleil produced effort, is that company's first Dork Age). Tellingly, the shows of this sort that still draw audiences are mostly comedy-magic hybrids that find new twists on the familiar: Penn & Teller, the Amazing Johnathan, and Mac King. (The key exception to that rule is David Copperfield.)
1983's Legends in Concert was the first all-celebrity impersonator show; the format remains popular whether it's a revue tackling many performers or one performer/group representing one act. The original is still running, and has launched several other companies elsewhere.
Danny Gans' success in the late 1990s spawned a wave of shows based around one performer delivering a bunch of celebrity impressions.
The country music boom spearheaded by Garth Brooks inspired several revues in the mid-1990s.
Any dirty ventriloquist act (such as Jeff Dunham) is heavily influenced or sometimes downright copying an act called Otto and George. Otto and George never hit the mainstream, but his limited fanbase includes Penn & Teller, Howard Stern, Opie and Anthony, and back when they were still alive, George Carlin and John Lennon.
Cirque du Soleil was likely the inspiration for the importing of dubious foreign variety revues at the turn of the millennium, as well as mostly unsuccessful direct imitators (Imagine, Storm). Ultimately Cirque mounting as many as eight different ongoing productions in the city at once broke the trend, especially after the nasty reception Le Reve, mounted by a former Cirque director, received upon opening in 2005. (Said director also mounted Celine Dion's first Vegas show.) At this point, many are fervently hoping for a new megahit show that will break Cirque's dominance, but the ongoing economic downturn has left rival producers without the means to create worthy competitors.