by then it's not unlikely people will be pushing 500+ghash on their own with DIY asic chips.
You'd need to put in a considerable investment. Developing ASIC chips is not cheap. You'd need several million spare for development and more. I doubt BFL will let any old tom dick or harry use their IP. I'm sure there are many more companies like BFL will appear over time. It's a good thing for BitCoin companies are sinking this much in R&D. Difficulty continues to increase...