The trick here is these builders are very smart. I wouldn't say they are colluding, but they have certainly done enough market research to ensure that many offerings in the market do not overlap each other at the same time window. That way, they have less reason to offer incentives or other sweeteners to choose their product vs. another builder's.
For example, OH will likely beat Hidden Canyon to market, meaning they will be the only game in town at the high end (until HC opens). So if you want a new construction SFR at that price point in this town, you have to play their game or wait it out.
With PP, five points is also doing this... i would be willing to bet that they slowly release the remaining tracts in the GP so they are not cannibalizing sales from their own neighborhoods.
That being said, once more units come on line (when baker ranch and GP are in full swing), i could see the pricing leveling off. But the builders would obviously slow down production to keep them from having excess inventory.
Think about this... Enzo Ferrari was once asked how many vehicles his company decided to manufacture each year. His response "One less than customers will buy". In other words, he knew that to keep prices high, he would restrict supply.
