I am on the wait-list too, but I don't intend to wait any more. If you have other offers, I say don't gamble your future! I believe that most of the people admitted to the program will accept their offers (at least two people that I know from forums, and Yale admits 4-6 people as far as I know). Also if you are certain that you will prefer Yale to any of your offers, you might wanna call them and inquire your position on the wait-list.