The curious thing about MH is despite getting rejected to include the Hunter as a fighter, they could have put a proper stage, spirits, music and own symbol, like Animal Crossing situation in Brawl (who had everything but a fighter), but it didn’t happen, who knows why. Maybe it was just time constraints and they give priority to franchises with playable characters.
But as I said numerous times, its very very likely we will see more Mh content in smash. At minimum, Smash 4 MH costumes and specific spirit events for Rise and Stories 2. At best its own CP pack with everything (fighter, stage, spirits, music).