you do realize, that the jutsu will take over 3 days, right?
if itachi and kisame are going to settle for just "delaying" the konoha, then they'll have to fight for several days

also, it would hurt itachi's character too much for him to lose to the opponents he's facing right now.
he made it distinctly clear that kakashi's sharingan is no match for his own....and im inclined to agree that kakashi will never lay a finger on itachi throughout this whole series. Naruto and Sakura mustve gotten stronger, but it'll still be BS for them to do anything to an akatsuki. The old woman.....well....we have no idea what she can do