Billions of people? The shows and movies were watched by millions and produced by thousands and for most of the latter it was a job like any other.
You just gotta watch TFF to realize that Shatner treated his fellow actors like crap and while I enjoy him very much in the role of Kirk he isn't single-handedly responsible for Trek's success. There are plenty of actors, writers, producers and directors whose input was also essential.
It's great that you like Shatner, we all have some Trek actor or writer which we like. Not that I mind that Shatner didn't stay in shape, he is an actor and not a bodybuilder, but please remain in the realm of reality and avoid self-satire like "Bill working hard at staying youthful".