The basketball team has black trim, they've never had a black uniform (yet). The football team has had black trim on the away jerseys for about 15 years now.
What I don't get is why you say wearing black would bring so much "excitement". If they aren't excited to play in the CFA Bowl in primetime on NYE against a good VT team already, then black jerseys are the least of anyone's problems. And pray tell me WHY it would bring more exposure? It's the only game on, and they've already worn the black jerseys. Do you think the headline would be "Vols wear black jerseys...uh..again!"
Your argument is extremely weak; I personally don't care one way or the other but this picture you paint is that with the black jerseys they'll be hyped to the moon and everyone will be peeing in their pants with excitement but if we wear orange then everyone will be bored is ridiculous.