First to market trumps technology currently. Eventually it will be cut throat enough where Power Consumption plays a key role but that won't be for a while.
I'd rather have 1 TH right now consuming 10,000W vs 1 TH 3 months from now consuming 1,000W.
If the time to make the chips is the same (or very close) regardless of nm size then I would opt for the better one.
I'd say it destroys uninformed customers much more than it destroys companies. Companies can calculate their profit margins and time-frames with great expertise. What happens when the Avalon bought today is the GPU of 2014?
Shit, I think we are already there. GPU mining is dead unless you have free electricity, at current difficulty, a 10GH miner will only produce .19 BTC a day... what will they make next week?