Funny you mention Miami. When UT played Miami in the '86 Sugar Bowl, I worked with a guy who was a die-hard Canes fan. He offered me UT and 21 for 100 bucks, which was a lot of money for an E-5 in the Navy with 2 kids. I told him he could cut the points in half and double the bet. And I took his money.
So, Miami? No. Duke, no. Not in any sport. The only sport I really have any interest in anymore is college football, and I'm not sure how much longer that will last. But I'm a Vol fan across the board; I just don't watch much besides football anymore.
I get what you're saying, but for me the "Enemy for Life" is Florida. I'm fine with those who hate UGA, but I don't. UGA is a blueprint for how you get to the point where you can (a) win SEC Championships; (b) beat Bama; and (c) win a Natty. Maybe we should be paying more attention to how they do it, as opposed to staring down our nose at UT fans who know a winning formula when they see it.
Go Vols.