Well I'm reading that scripture in Jeremiah 29 again, and no, I don't see after God saying he didn't send those people where he says to stick around because they still might have some good biblical teaching after they've spoken falsely in his name.
The part about sticking around to see what else they have to say in case you'll miss something really good isn't in this one either that I see:
Jeremiah 23:16
Thus says the LORD of hosts: “Do not listen to the words of the prophets who prophesy to you, filling you with vain hopes. They speak visions of their own minds, not from the mouth of the LORD.