Slamdunk, interesting points but I beg to differ.
1) New homes are priced lower than resales but that does not mean it is cheaper. New homeowners have to put in landscaping (extra $100k to 200K), upgrades, and misc. things like window treatments (which are unbelieveably expensive). New homes also tend to have much higher HOA fees (see V of C) and some old homes have no mello roos (at least in Irvine).
2) Builders are large corporations but so were Pan Am and Enron (also see the American car industry). Also see:
www.cnbc.com/id/21249064/site/14081545 and
www.cnbc.com/id/21267203/for/cnbc/
The fact that they are big companies actually makes it more likely for them to discount the homes faster and more substantially because they do not want to keep them. Resellers (who are not foreclosed upon) will simply stay if they cannot sell. Also builders have a much lower base price (cost of construction + land + overhead) where resellers want to try and at least break even with what they bought the homes for.
3) I do not buy the "seasonal" argument. This year, every excuse has been pulled out. Prices are lower first because it is slower in the Spring so sellers want to motivate buyers, then it is the summer selling season so builders want to have buyers come in to ensure good numbers, now it is because the builders want to close their books. At a certain point, someone has to say that house prices are going down because people do not want to buy.
As for future development, builders are caught in a no win situation. If they build more homes, they are increasing inventory. If they do not, they will have to continue to 1) discount the value of their land and 2) pay for the holding costs since no one wants the land. Also, since builders' only business is to sell homes, no sale means no revenue. Finally, housing is like a locomotive. It is hard to start and stop. Once the builders slow down, it will take a while for them to go back up again.