If you are commodity trading you could not care less, ASIC did not change anything to first order. However I think ASICs are bad for the currency functions.
With CPU and GPU mining anybody with an hour to read up on the topic could participate, and by word of mouth pull other users in. Let's face it, nobody is going to make the required investment in a new miner without a reasonable ROI prospect, so new miners are those that already have the hardware.
In a sense it is similar to real gold; to make a profit you need to be a large company, but this makes gold not easily accessible to consumers and thus impractical as a currency, while it is still fully functional as a commodity. Due to the lack of industrial applications of BTC (as opposed to gold) in the long run it must succeed as a currency. With small scale hobby miners quitting there is less talk about BTC, leading to less PR, which could drive BTC price down, and thereby also affect traders. To save the situation we would need much improved capabilities to pay using BTC in our everyday lives.