Well, a campaign is really nothing more than a series of scenario maps linked together by a story.
Scenarios would be a welcome addition as well, with or without a story (I dont think it would be too hard to write a paragraph before and/or after the scenario to link it to the other scenarios, thus making a coherent story). How much better would you be at the game if you had to take out a system with nothing but 10 light frigates and a couple of siege frigates? A scenario lets you focus on developing the micro-management skills necessary and teaches you how to make due with what you have available right now.
Now, if someone could engineer the above setup, and save it, and distribute it over the internet; that would be helpful to alot of people. The problem here is that after the next update, it will be invalid. On the other hand, the tutorial 'scenarios' dont seem to be affected by this, so there may be a way for the devs to let people designate certain saves as 'scenarios' or maybe build them in galaxy forge. As I said, a small paragraph before and after the scenario could be sufficient to tide over those of us who want a campiagn as well, but is not strictly necessary.
There are also features of the tutorial missions (the pausing+messages, instant spawning of new ships/planets) that could be leveraged for additional campaign-like features. ie, you are in the scenario mentioned (10 LFs + 2 Siege) when a 2 enemy capital ships phase in. A message box pops up (maybe a way to put a picture of the captian up there too) saying, "Surrender!", followed by another message saying that you will have capital ship support, but not for 2 minutes or so. So, then the idea is to survive for that long.
My point is that all the necessary ingredients to make a campaign are already there, why not make one? Or, allow the community to make one? If it's good enough, it could be officially adopted as part of a patch. Right now, the game is setup to prevent this type of modding, and I, for one, don't understand why.
Saying, 'we dont need a campaign because i dont care for them' is a horrible reason argue against this. That's like the people who come on the forums demanding that the devs buff their race because they dont really care for the others.