And since so many people here have already listed many of my favorite celebs, here are some other celebrities whom I would personally like to hear as the next Spaceship Earth narrator that no one has yet mentioned on any of these threads (though you might not agree with all of my choices here):
Charlize Theron, Don Cheadle, Emily Blunt (though she may be used for a future Mary Poppins ride at the same park), Emma Stone (Call me crazy and stupid, but I am simply in love with that low-pitched husky voice of hers. Also, "Remember how easy it was to learn your ABCs?"*), Gwendoline Christie, Jennifer Saunders, Lena Headey, Mahershala Ali, Minnie Driver (How cool would it be to have Jane from Tarzan as your communication history guide?), Naomi Watts, Natalie Dormer, Tilda Swinton, and Will Smith (unless you guys are super tired of hearing and seeing him now).
Viola Davis and Octavia Spencer could also work, though I think they would both be better suited for the Hall of Presidents than for Spaceship Earth. And the youngest two celebs whom I would remotely accept as the ride's next narrator would be Margot Robbie and Jennifer Lawrence (assuming the latter's narrator voice would sound noticeably better in her 30s than when she narrated A Beautiful Planet back in 2016, but we'll see).
*Somebody HAD to say it.