How could the same person play Pennywise and also Frank-N-Furter? And yet, Tim Curry did it, no sweat. He embodied everyone he was told to play while still letting a bit of himself shine through, a true talent that most actors can only try to replicate (usually unsuccessfully). He was loud, cartoonish at times, exuberant, and joyful.
People are mourning Dolly because she was a rare light of kindness and goodness in a world that is needlessly cruel more and more of the time. And Dolly didn't save that light for those lucky enough to see her play live or even just for those who liked her music. She showed up for the folks the world is most cruel to early, and often.
You want a movie with Paul Rudd, Elizabeth Banks, Amy Poehler, Janeane Garafalo, Molly Shannon, and fucking Bradley Cooper? How about H. Jon Benjamin playing a sentient can of vegetables?