GPUs are ubiquitous. When you have optimizations of hashing algorithms, like for scrypt and sha1 before it, you end up with specialized hardware often coming out of a few hardware companies dominating the entire mining scene.

That means a stark concentration of mining power, because it means "average joe shmoe" can't just start running cgminer on their integrated openCL hardware and get coins at reasonable rates for the money invested (in power).

I think it is too late for litecoin, and would rather see them implement this in a less entrenched altcoin like peercoin, because there is too much inertia and scale now to change it in the litecoin space.