Most of the original voices have left. The remaining can’t voice characters outside their ethnicity.
What? The 6 of them are all still there. Hank Azaria gave up Apu/Lou/Carl and Harry Shearer gave up Dr. Hibbert, but the vast, vast majority of characters are still being voiced by the same actors.
I do think that the fact that The Simpsons has been on so long that they had to go ahead and do that is strong evidence that the show has run its course + ought to end, but the re-casting is a symptom, not a cause.
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