I still don't think everyone understands the work necessary to create a good narrative campaign that will work for modern players. Yes, we can string scenarios together and put some text on the screen. That was fine 20 years ago. Today, people will want to see cut scenes (whether pre-rendered or with camera tracks in-engine) and have audio tracks and dialogue. You'll want custom animations too for the cut scenes.
What you're talking about is:
A screenplay for the entire thing
New animations
Camera tracks
Scripted events
20+ custom maps
New code for cut scenes and other things
Foley work for new sound effects
Voice acting work and sound editing - Huge
UI work
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Essentially, you are taking what we've done for the game so far and then almost doubling it.
The Macedonian campaign took and is taking a lot of work. Good work has been done. Even then, it has almost none of the things I listed and what an official campaign will need. I'm not poo pooing anyone's ideas. But if it's the will of the Council to cast the Ring into the fires of Mt. Doom, then I'll see it done. I just think a Strat Campaign, while taking a lot of work in itself, would be easier to achieve.