We can rebuild it.
We have the technology.*
Despite the outlay of millions for repairs, a leaking levee in New Orleans is causing some concerns. In fact, the article states that this seepage is due to the mushy soil upon which the very city is built.
Whyzzit so easy to call people who build houses near volcanoes "dipshits" but we accept with unblinking veracity the sanity of all those asshats who stalwartly demand to go on living in New Orleans, calling it a national treasure and all that?
Why did ancient civilizations abandon some cities? Maybe because they weren't working out? Maybe the ancients were smarter than we are. We'll bang our heads bloody against a wall before we concede that *ahem* perhaps we can not overcome nature in all instances. Perhaps if one builds one's house on sinking sands, one deserves one's house to sink.
*extreme sarcasm mode