Oscar Mayer may have tumbled to the advantages of a smaller weiner. It's cute and cuddly, and doesn't frighten people away. The small weiner can go many more places than a big weiner. Consider the turning radius of the small weiner on tight city roads -- narrow, low tunnels no longer prevent the passage of the big weiner, and you can even take the small weiner through the backdoor of some venues. Finally, let's not overlook the economy of the small weiner; it simply lasts longer for the same amount of fuel.
I'm a big weiner guy myself, but the ladies have told me that on occasion, the big weiner is just too much. In the hands of an unskilled driver, I've heard the big weiner can cause havoc. At the very least an unsatisfying experience.
Good call, Oscar Mayer.