I can see that being a very good idea, especially for Quickstep. Not sure if same theory would work in other dances, but it is worth considering.
My wife is a few inches taller than I, and it's never been a problem, other than maybe if my suit coat is a little tight in the shoulders and I am trying to turn her.
Speaking of that, the great Mickey Rooney was doing a show in our town last weekend, and the TV stations here were showing some of his old movie clips as a promotion. Does anyone remember "Babes in Arms" when Rooney is dancing with a woman like twice his height and he keeps banging her in the head when trying to turn her? Then he decides to leap in the air every time he turns her, and it is just hilarious. If I can find it and download it, I am thinking of showing it to any couple I am teaching in which the female is taller to illustrate that anything is possible!