Natural wonders

[ElliotS]

So I've gotten it twice recently, and I'm finding the Mt Kilimanjaro promotion to be almost a win the game button, added mobility to everything makes wars so much easier. IMO, all three promotion NWs should become normal NWs with six yields and no promotion. Tbh, I'm prob making this change for myself either way, but I thought I should get the community's take first, see if y'all agree or disagree with me.

They're fun though... Honestly I think you should lose all promotions if you lose the NW and gain it on all applicable units after controlling it for ~5-10 turns. This would be better as far as counter-play goes.