It would still be good if it was written in a different language. Probably even better because the developers would have more time to improve the software instead of reinventing wheels, writing boilerplate code and chasing down segfaults.
No it didn't. C happened to be the most popular language for a long time but that doesn't mean people couldn't have written software without it, or that if it hasn't been so popular a better language wouldn't have arisen.
English is very popular but you wouldn't say "English is what made all those books possible" would you?