The great thing about Muppets is that they never die.
Oh, their puppeteers and voice performers may die, but the Muppets themselves never die.
They’re characters. They’re roles.
Just about anybody can stick their hand up Kermit, Ernie, or The Swedish Chef and make them dance.
It might take a bit of practice to do Big Bird or Snuffleupagus, but they have understudies and backup performers for that stuff.
And when the Muppet puppets or suits wear out, the workshop makes new ones.
The old ones go to museums. Or the security vault.
In case they try to get free.