I'm pretty sure I still would have watched TOS, even if the other series had never been made. I generally don't judge a TV show based solely on its age. I love M*A*S*H
, and it ended two years before I was born. And I Love Lucy
was decades before my time, and I find it hilarious.
Plus I kind of love cheesy sci-fi. It's one of the reasons why I'm such a huge Mystery Science Theater 3000