This is exactly my sentiment, Scarf Ace. I actually also believe these people with unrealistic co-op expectations are not the majority.
I would like to have the ability to share campaigns with my friends either full time or not, in that fashion. I think it would immensely help the game to have that feature in vanilla, letting every mod out there benefit from it and add their own flavor/features to it.
I believe the Battle Time mod sparked quite the attention. It's a little annoying to setup and use, unfortunately.