A Risky Idea!
You guys are in the language business, whether you like it or not. So it's incumbent upon you to do your best to preserve and promote our English language.
The misfit speaking by your various on-air talents should be embarrassing if you take your cultural responsibility seriously.
Here's the "risky idea": Require all of your potential on-air personalities (anchors, commentators, analysts) to pass a basic grammar and pronunciation test. Perhaps you should include producers and editors, as well.