I'm starting to understand it a little better after studying it a bit. I don't think it will drive BTC "prices" down because there is a finite amount of the currency that is possible to be created. I don't think it can create a glut (I could be wring on that). There are a couple of incentives not to hoard all of the computing power.
1. Benevolent users want to avoid the "51%" attack. It could undermine confidence and perhaps cause users to flee.
2. It's possible that we'll see a hashing power arms race where several cycles of ASIC production supersede or render the previous generation unprofitable. While it may be possible to go it alone and win, it's still a risky prospect, for the above reason, and for the risk associated with ASIC development. Therefore, ASIC developers have an incentive to distribute the machines into the hands of BTC users at large, and quickly.
These ASIC miners are going to have a limited profitability lifetime. While it may be years before they are uneconomical in terms of the cost of the electrical power to run them, they could be rendered barely profitable by a faster generation of ASIC based machines, or by an unfavorable turn in Bitcoin exchange rates; which could happen on a time scale of months or even weeks.