We all know, what ASICs have done to Bitcoin.Difficulty is sky rocketing every 12 to 15 days and there is a fierce arms race to grab those tera hash machines most of which will never produce ROI. Those ASICs have even defeated the true purpose of Bitcoin i.e. a meant to be decentralized currency now has been centered around a few affluents who could afford those expensive ASICs.
Already, scrypt ASICs have hit the market and more to come in from July onward. Diffuclty will zoom up and there is no guarantee that prices will respond accordingly , because price of a coin depends on it's demand not on hashing power, which only increases supply.
GPU will definitely finds it's way to survive each time with different algo, because it's a affordable mining tool for masses. Scrypt coins are already outnumbered by X11.
More x11/scrypt multipools are coming into the market and they do their due diligence before decide to mine any coin.One can mine with those multipools if not sure about a coin.
I think thats is why PoS is the future. Mining will always be wasteful and inefficient and centralise.