There are only 7 World Wonders in total. This means, if Phenomenon chose to build one, UNT can not build that same wonder, nor can D12 or *TBA or TDC... Each one would be different... At least, that's my understanding of it...What do you mean? I'm not sure if you mean this, but are you saying that there are only 7 world wonders overall, or are you saying that to stop an alliance who has 6 WW from winning is to take one city in their WW islands?
It makes sense if you wanted to extend the gameplay on a world for another 2 years as long as the activity doesn't diminish, but I still loathe the idea of taking away all this time to start all over again. It's kind of like, we didn't all jump on the 2.0 wagon when it came out... so eventually we will be pushed into it whether we like it or not.