........... He literally wants to uncover the true history. The ones who are covering the true history are the World Government. Not to mention he's a D and it was emphasized recently that the D are very, very important. I think it's clear he'll be involved. Maybe not fighting the Gorosei like some theorize but he certainly won't only appear "reading a newspaper of Luffy's victories".
It appears that the Gorosei aren't immortal because of the op op no mi, but Imu was implied to be by Ivankov. He probably shares the immortality with them somehow.
and you really think Law doesn't have beef with the guy that destroyed his ship, defeated his crew, stole his poneglyphs and was about to kill him?
he's too popular for Oda to abandon at this point lol
He may want that, but it doesn't mean he'll accomplish it, there have to be losers, people who couldn't accomplish their dreams, that's Law and Kidd. And Robin's dream is also to uncover the true history, and she's infinitely more important than Law, Law's dream will probably get achieved, but he won't be the one to do it.
If Law was going to be even half as important as you want him to be, he'd have appeared in the big double page spread of future relevant characters.
Ivankov theorized, but he has no way of knowing. Also, unless you believe Imu can't regenerate like the Gorosei can, then it makes no sense for his immortality to be because of the Ope, which is specifically unaging.
Law lost bro, he's done, he doesn't get a round 2 or a come back.