You know, when you really think about it, weren't many of the prophets doing mostly that? I mean, it seems to me that most (not all) of the OT prophets messages could be boiled down to "Just follow the law and the Lord won't punish you according to what He ALSO said in the law!" Sure, you had cases where Samuel was telling Saul exactly what was going to happen to him as he went away, and of course the Messianic prophecies, but for the most part, many of the prophets were really just saying "Follow God's law! It's good for you!" Which ... it is!
In fact, thinking about the prophet Jeremiah, how is it unbiblical that God would not raise up a prophet to say "Turn away now. It may yet be that I will forestall divine judgement upon the nations." Even knowing that judgement would come to Israel, he still commissioned Jeremiah the prophet to warn His people.
When it comes to prophets existing in the present, my personal opinion is that *if* they're here at the moment, they're working in places where they're needed and directed by the Holy Spirit, and that done quietly, helping individuals and not nations. Beyond that, we know there have to be two prophets appearing in the future, as documented in Revelations. That much is certain, at least.