I Itachi would let himself get killed like Sasori, he'd lose.
I think if Sasuke could kill Itachi right now, it would
1. make Itachi look kinda weak. Just three years training and then win against Ms. It doesn't really make Itachi look strong to me.
2. Portray a false attitude. He cuts his bonds, goes to Oro (which is like betraying Konoha and his friends), he is doing evil things, he is using Oro's jutsu, he is using people etc.
If he can beat Itachi with that.
I'd rather see that he failed and in the end realizes he needs his friends to be truly strong. Corny, I know.
But it's not that different form the Garaa/Naruto theme. You can only be really strong if you fight for someone and not yourself. The path Sasuke choose should not lead to his goal.
My two cents
"For Feanor was made the mightiest in all parts of body and mind, in valour, in endurance, in beauty, in understanding, in skill, in strength and subtlety alike, of all the Children of Illuvatar, and a bright flame was in him"