First of all, yes. This is not 343's Forum, the place you are looking for the Halo Waypoint. And yes, this place has the rights to be this place, because if not 343i would have sued it 2 years ago. It's still here.
Your first idea is a bad one. People buy Halo for Halo, not for Matchmaking. Similarly, people buy Call of Duty for Call of Duty, not Multiplayer. A game has multiple aspects; remove one and you cut off the game. I mean, imagine a campaign only Halo. Is it gonna be bad? Uh, yeah. Why? Because you removed whole aspects of the game; Halo is now no longer Halo. You are no longer spraying covenant blood 10 feet into the air.
Well, if you truly want a map-editing game ONLY, you could just get on one of those applications that creates islands and stuff for you, and you can start playing allll daaay loong.
Your second idea would probably be a great thing when they start getting included in the story....and in 2025, when the Xbox 1280 can handle it.
In all honesty, G-Mod is G-mod and Halo is Halo. I love things like Trouble In Terrorist Town appearing, but it doesn't mean we can't do things in Halo the traditional way. I mean, personally, I enjoy playing Clue, which is jsut about the same as TITT.
It isn't a terrible idea, but think about what you're saying. There is already Minecraft. There is already Garry's Mod. There is already Halo. Now you want all that stuff combined for you to lazily play one thing.
Well, that would take the fun out of Gmod, out of Minecraft, out of Halo, and certainly somebody will get sued.
Oh, and be happy this isn't Halo Waypoint, because if it were, you'd be flamed so hard people would probably have their posts censored. We aren't a close minded community; it's just that when you're asking a game to be made that will involve breaking down Halo, along with plagiarizing gameplay mechanics of other, great games, you probably won't get a positive reaction.
I like playing Halo for Halo. I like Forging. I like Customs. I like Garry's mod. I like Minecraft. I definitely don't want somebody making everything into one because that would be like gulping Hamburgers, Ice Cream, Chips, Candies, and tons of other great things all at once. What once were seperate amazing things, come together, will make a puddle of goop.