Yeah, I won't deny that ASIC will be more energy efficient. I'm working on developing a fork right now that overcomes this problem without severely impacting GPU performance. In the meantime, I'm mining LTC because I can see it continuing to be a major force in the land of alt. cryptocurrency.
Interesting.
Also just to clarify LTC puts up a high barrier to such designs. The "multiple" in terms of efficiency (hash/w and hash/$) over a GPU is much lower. While a BTC ASIC may be 1000x more efficient as a GPU a LTC ASIC may only be 20x as efficient. I doubt LTC will ever become large enough (we are talking about a valuation larger than BTC is now) to warrant that kind of investment. The total annual mining rewards are simply too small to make the risk worth it.