I think many Marvel fans would agree that seeing Wolverine fight in an Avengers movie would be quite the dream come true. And, if the timeline had worked out right, Hugh Jackman claimed he would have been game to enter the MCU, as well. Alas, it wasn’t meant to be and now a new actor will have to wield the adamantium claws, instead.
Article source: https://www.cinemablend.com/news/2549673/avengers-endgames-joe-russo-reveals-the-marvel-character-he-wouldve-loved-to-use-in-the-film