^Unless Pakistan can find a better ODI spinner than Afridi, why not consider Afridi as only a bowler in the team and not formulate any plans around his "potential" with the bat. His batting, when it comes off, should be considered as BONUS.
Afridi made his debut as a BOWLER...and that is how it should be....pure and simple.
It reminds me of Irfan Pathan who started off only as a bowler....then people found out that he could also bat well...then suddenly Irfan was being asked to bat in the top order (sometimes even open the innings). For the player himself, having all-round capabilities is sometimes a double-edged sword....people expect you to perform in both departments...(and I don't think they get paid any more than the specialist players for added job responsibilities).
I have never been one of those calling for Afridi's exclusion just because he is so erratic with the ball. He should not be dropped and should bat at 7. If he comes off with the bat, yes it is a bonus otherwise he earns his place in the side purely on bowling merit.