IHMO, ASICs just become doorstops and worthless in a year or two. Additionally that ETH ASIC your looking at is likely to become bricked on the main ETH network. So your options would be ETC or other ETH-hash algos(if they dont fork). Right now a GPU rig with 6-8 AMD 580's mining ETH is not profitable unless your around .08Kw/c electric rate.
That's the advantage of GPUs over ASICs - it's much easier just re-selling them... But for now like you said the profitability of mining is determined by the electricity price.