"To many longtime or lifelong viewers, The Simpsons is not The    
   Simpsons without the original voice actors at the wheel. Like the    
   rest of the cast, Kavner is such an integral part of Marge that    
   replacing her could lose so much of the charm and heart that    
   endeared us to the character in the first place. Kavner’s been a    
   core part of The Simpsons since its days as a recurring segment    
   on The Tracey Ullman Show. After more than 35 years as Marge,    
   surely no one could replace her, let alone mimic her, right?    
   Without Kavner’s distinctive voice and her wonderful acting    
   range, would any other version of Marge work?   
      
   One potential reason for the hesitance is that, despite some    
   successes on other franchises, some of the show’s biggest fans    
   have seen for themselves the damage a major casting change    
   can do. One of the show’s most popular international dubs. The    
   Mexican-produced Latin American-Spanish dub of the show, Los    
   Simpson, recast nearly everyone, resulting in nearly two decades    
   of worsened quality.   
      
   American viewers tend to consider the first eight seasons as the    
   show’s gold, but Latin American viewers are more likely to    
   extend that period to Season 15. That’s because, when they think    
   of Los Simpson, they think of those first 15 seasons with the    
   original Homero, Humberto Vélez, in charge."   
      
   See:   
      
   https://www.thedailybeast.com/obsessed/the-reason-the-simpsons-f   
   ns-fear-new-voice-actors   
      
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