If there is not one person who will be it, then we must make our own. You don't need to inspire all people everywhere in one go, so you don't need 12 million followers to do that.

You just need to look around, and then do your best: volunteer at school or uni, post Kerbal Space Program let's plays, or use a top to explain angular momentum to a 2nd grader.

We can't rely on one or two celebrities and then sit on our hands. We take our telescope across Africa and inspire a few kids at a time, all the time.