Not so! Jim wanted it that way anyway!
He did want to do a deal with Disney,
as long as Disney would have creative output from
his characters and not the Sesame Street ones which he felt were entirely different entities, which he was right.
Disney may have had a different way of handling the Muppets than Jim, as well as make some blunders en route, and they're kind of in the shadow of all of Disney's first-party content and others properties like Marvel and Star Wars, but that doesn't mean they haven't done a good job with them.