Although there has been a decline in BTC value, the future is not as predictable as you make it seem. I sold 3 BFL units in the last 3 days. Who buys BFL units? People looking to start get into mining. Everyday people read and learn and become captivated. Unfortunately, there are many out there who believed that a BTC should have been worth $1100USD all the time. This is not the case. Its dropped down and its sitting flat line. If it retains its current value, ASIC machine will retain value until new tech comes out.
The more I look into BTC the more I am seeing become useable. More people online now accepting BTC as payment. Hell if my boss decided to pay me 3btc per week for work, I'd take it. It needs to become readily available. Anything as new as BTC will still seem extremely foreign to non tech savvy people.
One day electronic currency will completely replace fiat currency. I'm not talking about tap and go with your mobile phones, I'm talking systems like we see in place here. If you could tap n go with your BTC for a meal during your lunch break, it would be great. As long as it remains a decentralized and can't be 'taxed' and 'regulated' by governments then this is something that will be around for a very long time.
I just stayed at a Hotel that I made reservations online thru Expedia and was able to pay for it using BTC. It was very fast and easy to use.