You are more likely to get a rivalry out of an in conference foe such as STL,
Duq, or VCU for now...the first two if they actually got their heads out of the sand.
I think the MAC schools are logical programs to throw in the mix, but other than local alumni bases...no one cares about those schools and there isn't a history with anyone other than Miami. That game has always been fun, but we see it as more of a rivalry game than Miami does. There is nothing rivalry about going to a game at Millet.
Rivalries aren't scheduled, they are made....through history, tradition, geography, dislike, respect, etc...For the majority of history, the X/UD game was a rivalry for us and them...if we were to play today it would be more about UD than X as they have moved on. Even then, other than UC...who are their rivals? The only logical ones would be in Fairborn and Oxford...they are logical rivals due to geography and history. Other than that, there is nothing there other than some media hype.
Unfortunately, I think that there is probably a bunch of that across the landscape...look at UNC...they have Duke...NC State maybe...and other than that, any other powerhouse they may play from other conferences. They wouldn't see the other ACC schools as rivalries.
