I believe IQ is fairly static, at least it's hard to improve the fluid part. But, there is a very important variable that both sides of the debate always miss:

I believe IQ is fairly static, at least it's hard to improve the fluid part. But, there is a very important variable that both sides of the debate always miss: free will. If someone refuses to exercise their free will, then a high IQ is unimportant. On the other hand, if someone is less inhibited about using their free will, they can come up with more insightful ideas than a high IQ person. Case in point is Feynman. He's known to not have a surprising IQ, but his willingness to think outside of the box and do outrageous things allowed him to come up with much better insights than his smarter, but more timid, colleagues.