Never gonna happen.
Miami has something like 37,000 in attendance in 2001 for Temple in the beloved Orange Bowl—the Canes finally good again after probation and years of sucking.
There's always something better to do in South Florida on a Saturday in fall if the Canes aren't a hot ticket. Miami isn't a sports town, it's an events town—and the game needs to be an event.
The city was on fire for Notre Dame in 2017; star-studded event and packed house. You'll never see that for Bethune-Cookman or a run of the mill ACC game.
I lived in Tuscaloosa, Alabama and Gainesville, Florida for years (combined). Football is literally everything there. The university is all the town has. Kids in nearby apartments had 52-20 painted in shoe polish on their apartment window for a full year after the Gators won that 1996 title.
You also discount that these college towns are state schools with 30K-40K undergrads and a slew of alumni that stays in town after graduation—where Miami is a private university with 11,000 undergrads in a large, diverse metropolitan city. Most Canes fans didn't attend UM and there's not the same loyalty and devotion to the program (across the board) that you get from alumni, who stick it out think and thin as it is their school and not just their sports team. Most Miami fans treat the Canes like a pro franchise and check in or out depending on the quality of the product.
Regarding recruits, yes, these kids will be a bigger college football experience and more pageantry for six home games a year, but what about the other 46 weekends of the year? That is where Miami kicks the *** off of every one of these one-horse, podunk little towns. They're all rah-rah on game day but a snooze fest the rest of the year.
The kids who want to be the big fish in the little pond will choose the small college town, or will be pushed there by family who wants them to theoretically stay out of trouble ... but those who know; they realize Miami is a completely different ball game. Win big during the season, have fun in paradise the off-season.