I love rants.
Anyway, your ideas are alright. Dedicated servers would cost a lot, maybe more than 343i can afford.
As for separate playlist, i like them just the way they are. It's fun to choose a playlist and not know what's your going to get, although it can be tough trying to get the gametype you love. although the original MM in Halo CE was awesome. That would save 343i from making seperate playlist for gametypes and/or maps. Just use this.
Also, Mr Eos said that he didn't like people creating custom stuff. I love custom stuff and I think forge and/or modding should be customized. I hate in forge when you find the perfect peice, but it sticks out the other side of the wall. It would be cool to be able to change the dimensions of that object, like length width and hight. And maybe Modz. It was just so fun to sit down, join a game, and fire your AR and it shoots ROCKETS! I loved it.
Custom Edition: this could solve the modding issue. Players wouldn't need to add in a pelican and such, they would just have to at the custom edition. Although a warthog with zebra-striped seats would be badass.
Did I mention I love rants?