The third generation of Monster Hunter was such an important time for the series, Capcom and the Monster Hunter team innovated so much in terms of map and monster design and the effects are still felt throughout the series to this day. I think that it would be incredible for players of the newer games to be able to experience the 3rd generation of Monster Hunter, especially since right now, there's no easy way to play these games, unlike MHGU and the two fifth generation games, there is no way to legally play them on modern hardware.
Monster Hunter 3 Ultimate is such an important game for the series but also for me personally, such a beautiful experience with incredible musical compositions, map designs, art, monsters, weapons and an overall good time with that old sense of wonder that you'd feel when booting up a game for the first time.