Simple: Give us Firefight 3.0I don't think infected Spartans would make much sense, Spartans have explosives to detonate their armor in case of death (at least the Spartans 2s did). As for the Flood, they've tried to turn Halo into a game more appropriate for kids. They're not going to make the Flood more horrifying, nor are they probably going to return (at least in my opinion).
- All the classic options should return, but with innovations. Make Halo: Infinite's Firefight something to remember, a real standout experience, and include a Flood mode within it.
In addition, the Infected Spartan and Elite ;) models in Arena and Custom Games (or the Halo: Infinite equivalents) should obtain the classic Flood Combat Form appearances but with truly horrifying updated imagery.
I'm talking about Multiplayer here (Infection), not the lore. 343i have already used Flood forms for Mulitplayer. It's nothing new. I just think they should make them appear more like the traditional Combat Forms from the Halo Trilogy. It would add a really fun element to the game.
In regards to your second point, the sooner they realise how ridiculous that idea is, the better. Halo is not for children. It never was, and never will be. If they keep trying to make it more suitable for kids, they're going to destroy the franchise. The main focus should be on making fun games. They should not be making gameplay or story decisions based on whether or not it becomes more suited for adults or children. Make Halo Halo
, and make it fun.