the murphy brown reruns are only on syndication, not on streaming anywhere. Teens binge stream older sitcoms. (well, old like "friends" so not that old).
I read an interesting piece about murphy brown, and they can't stream it because of the music rights. The original show had a LOT of music that was not only in background, but part of the show, so it's not just a matter of changing the soundtrack, and the legal rights for each were only for the shows at the time and reruns. So even if they could pay for and obtain new rights, it mean lots of lawyers and multiple contracts for each episode.
And I don't care if they play around with casting - gender or race - it's probably smarter for today's audiences, especially if you want to attract the key advertising demographics.