This is a pretty strong theory: more land ==> all these things, including overbuilding. What is "overbuilding" even supposed to mean? "Over" relative to what?
These studies indicate that the problem is slow permitting and high regulation in places that do have lots of land: http://blogs.wsj.com/moneybeat/2014/02/27/why-las-vegas-got-...
Texas and Atlanta have lots of land around them, but they did not have nearly the default problem of vegas and florida and california because they built a lot very quickly, so prices never rose dramatically.
In short, there was not overbuilding. There was underbuilding, and building that happened too late.