i think that you could argue both ways.
1. it is better to have not heard than being on a waitlist. how?
well, i am on IU's waitlist and just saw someone who interviewed there late DEC and then got accepted. so, as long as you get an interview (soon) then it maybe better to be waiting to hear something rather than being on the waitlist.
2. its better to be on the waitlist than having not heard anything. how?
if you are on a waitlist, you still have a chance. if you don't hear anything, chances are you will be rejected since the schools may fill their classes up.
what is all this mean?
simply means you won't know anything for sure unless you get that acceptance or rejection in WRITING!