Firecracker048: Man, I hope some DLC features him as a main character. He was a great character in the 2nd witcher, and really could only be of benefit in the 3rd 
  Yes. I wanted him or Saskia to be relevant in The Witcher 3 in the same way, or at least similar to, Vernon Roche was/is. So far, the only benefit I found to having taken the "Free Upper Aedirn" path was a free pass into a warehouse for a side quest.  
 That said, I've heard Iorveth's voice actor playing so many minor characters with similar levels of vocal bombast. I wonder if the impact would be lost on us? I doubt it. Roche's voice actor also plays many minor roles, but I don't know if any of them have any conversation tree sequences, whereas the Bloody Baron's sergeant does and Iorveth's voice actor played him.  
 Still, felt a little bummed that choosing Iorveth's path over Roche's path in The Witcher 2 leaves you with comparably far less follow-up in The Witcher 3 than the opposite choice.