When we use GPU, money from miners go to AMD's hand and doesn't comeback. When we use ASIC, the asic companies will use a portion of that money to promote their business, attract more users & miners come to bitcoin economy. This causes a positive feedback loop and bitcoin economy will boom. Right now, butterflylabs are promoting its business using google ads.
Actually reward halving seem to coincide with mining using ASIC devices. This may lead to a huge arms race, and the price may boom due to speculation.