Pretty sure we don't need to see a ranked/social split, dividing the player-base needlessly seems like a bad idea.
Also, you're going to get high levels of competition at the top ranks of each playlist regardless. As long as equivalent 1-50 exists.
Sprint will never be gone, but it might be a toggle for customs.
You need a split because some people play competitively and some dont, and also some like to see where they stand and have no motivation without. It encourages more players to play ultimately. Without the number people dont care or wont play correctly. Plus worse players will get matched up with better players and become disinterested, Trueskill is a joke and the number matching helps trueskill work better.
They need to keep all the crap they added, but leave it as optional powerups/pickups. This way you can have your social/evolving Halo gameplay but literally it will be default competitive Halo if you make custom maps without them.
This means the focus can be less on how can we patch in gametypes that do or do not have the additions of Halo and more on the balance of what do people want and what do people not want.
So on day one you can have your Team Hardcore mode which would be the default maps but someone went into them in Forge and removed all the bonus stuff and stripped the game down to teamwork and a more core gunplay + the power weapons (rockets/sniper/whatever) If ordnance remains this playlist would just use no ordnance option that would be added.
This assumes we go back to pre designed loadouts for playlists and perks are removed or turned into powerups where applicable. AKA you can automatically pickup grenades by default again but that will be an option in settings for playlists that demand it. Flinch will be disable by default but will remain an option in settings.
Sprint would be an AA pickup again and would not be default in any playlist. If you have sprint you cannot have another AA like jetpack, Unlike Halo 4 where you can have sprint and an AA which is just TOO MUCH.
Regarding Ranked/Unranked thats up to playlist manage but I would put some of the evolved Halo with the crap in a Slayer playlist like a ranked Team Slayer, have a ranked Team Hardcore(MLG), and a ranked Team objective, then I'd have an unranked Team Slayer and unranked Team Objective + 1 player (squad slayer). No unranked competitive list.
Unranked would also have multiteam + revolving weekly + BTB + and a team training mercenaries playlist.
Ranked would also have doubles, snipes, swat and FFA.
Thats 13 n I dont think I missed anything.