I'm sure Sean is still a part of Elijah's life but not as much perhaps as he once was. So much water has flown under the bridge since the LOTR days that they are bound to have moved on. But I don't know either of them so they may well meet up regularly only we don't hear about it. Doubt it though or Elijah would say so.

That caption sounds very unfortunate and I would prefer to think that it was a journalist trying to sell his article than believe that Elijah was sick of the role because he was unable to move on.