Hunter arena gear generally doesn't provide intellect. My gear in the process of being swapped out. I did lose AP by dropping CA as I was PvE built and specced before to take advantage of CA, however, now I'm in Arena and anticipate arena gear and losing my INT gear. I've already replaced some of my old INT gear. CA becomes less useful.
After WothLK comes out, I may respec back to PvE and if INT gear becomes more common, I may respec CA back in depending on the gear in the expansion. There is an INT point where it becomes more valuable than another talent.