Concerning the subject, more likely is that while ASIC rigs could very well cause difficulty to skyrocket, it is highly unlikely they'll cause the price to increase. If you have a $30000 loan to pay off, you're not going to hoard BTC the first week, plus the need to sell a substantial amount of mined BTC is likely to push pricing down.
Assuming they can get one rig per week out (which is doubtful, but whatever), the hash rate will go up and the blocks will be found more quickly, resulting in an accompanying spike in difficulty. Best bet would be to fire up the first such rig right after a difficulty increase, in which case you could get about 1/14 of the BTC for the next 7 days, and 1/15 for the following 7 days. The first person to start up their ASIC rig (most probably the company building said rigs -- just for testing, you understand) pays off the rig in about 8-9 days at the current prices. The second rig goes out the second week, and that person gets 1/15 of the BTC for the next 7 days, and 1/16 for the following 7 days. And so on and so forth. By the time the 13th rig goes out, the most likely scenario is that that person will only get about 1/26 of the total BTC for a week, and then 1/27, 1/28, etc. It will take them around three weeks at the current prices to pay off the hardware.
Now look at prices. By week 13, anyone who buys BTC is basically paying other people to buy expensive mining hardware, because those people are selling lots of BTC to pay off their hardware debt. We'd eventually be looking at half of all BTC mined being immediately sold, and if the ASICs keep coming that will continue to drop BTC prices. There's also the block reward halving to account for, which will double the pay off time and will very likely already be in place before the first ASIC rig hits the scene, so then we're looking at higher difficulty but less reward, and longer pay off times.
If I could get such a rig RIGHT NOW, yeah, sure, I'd try to find a way to scrape together $30,000. Unfortunately, I think mem is right: the whole thing will most likely be a fustercluck.