I would pay for a nice expansion with improvement and added gameplay such as diplomacy and maintenance (stuff cutout due to time -what Kufloaden). And if it would include the full editor tools as said above as promised way back when.
Most games longevity depends upon new content to keep the community alive.
And we know how greedy they are...Dark Horse Comic books comes to mind..original idea, yeh that was the original source material back in the 70's.
Similiar to Bill Gates hatchet job to stick us with HIS god ownership of OS. When Vista comes out and DX10 you may as well throw away all your favorite 'legacy' games. Be lucky to find the hardware to even run it. lol