Well, Pitt decided to join the Big East where only two schools played 1-A football – Villanova had just dropped their program – and coincidently, those two are who they're still in a conference with. Although, they only play Syracuse every season. Of the teams you mentioned, Virginia Tech is on the schedule every year too.

I think West Virginia, Temple, and UConn would play a yearly game right now, and Notre Dame pops up on the schedule every now and then – not getting them yearly. A yearly game with Navy isn't happening no matter what, they're in a conference without much wiggle room schedule-wise. On a side note, Penn State (main rival) ditched Pitt, and being an Independent wouldn't help Pitt in that regard.

Let's take a closer look here, I think you'll see that Independence won't help Pitt schedule most of these teams:

Army - - Probably could have a series now, but not yearly
Virginia Tech - - Already play yearly, going Indy could eliminate that
Temple - - Definitely could schedule a yearly series
Maryland - - Doubt they would schedule a yearly series no matter what. Nothing preventing a limited series now
Boston College - - This one sucks because of divisions
Rutgers - - See Maryland
Navy - - Schedule is restricted due to AAC conference slate and yearly Academy opponents
BYU - - Definitely could schedule a series
Notre Dame - - Staying in the ACC is the best way to guarantee a series with them
Syracuse - - Already play yearly, going Indy could eliminate that
UConn - - Definitely could schedule a yearly series
WVU - - Upcoming series if IIRC, should be played yearly during Rivalry Week