The III would be no less cost-effective than the Hybrid. They've already used the sole on the Hua, so they could just as easily have brought those out instead. They've actually changed the Hybrid completely by putting it on a II sole instead of its own original unit, which was likely more expensive than just putting out the III in the first place. We'll see Flare and III next year though, so there's not too long to wait now.
I hope to HELL they don't retro the III with the current III sole on the huarache retro. That midsole is trash. The mold is awful. I much prefer the 2007 retro III midsole to the most recent one. At least it's made with the correct midsole material.