I think its safe to say 343i can save Halo infinite by letting us mod the game.
Us as the community can help speed up the dev proccess of the game by letting us be able to make maps, weapons, vehicles, equipments and enemies.
Im pretty sure people are going to remake old halo maps like The Pit from Halo 3. 343i can add it as an official map. Same goes to the rest of the stuff i listed above. Make the Banished brutes or vehicles look more Banished like in HW2. Add more and bigger wildlife to the ring like rhino etc.