Yes, there's great potential/the music was awesome.
No, most people wouldn't really care. Rap is mostly about personal stories.
Many people listen to rap, and the style makes it great for conveying a message.
Only if they know what they are saying. If they make false claims or prescribe bad ways to respond to a problem, then it would have the opposite effect of misguiding its listeners. It would backfire horribly.
Hip Hop is an expressive art form, that most people who create it, enjoy the liberation of expressing personal experiences. That being said, an artist like Dan Bull, who raps mostly about video games, has an amazing ability to describe scenarios in games thru compelling lyrics. Someone with a similar style could possibly succeed at captivating listeners interests in other subjects.