My opinion is not worth very much, because I am newly spawned, but I will give it anyway.
I personally agree with the idea. Like Lord Rocket of Haul, I agree
that it will increase RP a fair amount, and the RP relationships, friend, foe, sister, brother, etc. I also think that it will bring everyone together in harmony, during the time period of building. It may also keep nations vulnerable, so it also may provoke war.
Large amount of damage:
Pros: Lots o' RP, new RP relationships, harmony. (war can fit in either one, depends one the opinion)
Cons: Lots of hard work goes into building everything, vulnerable nations. (war can fit in either one, depends on the opinion.)