Though we are concerned about UConn on this board, I could see Central CT upgrading to play teams like URI or Maine in the Colonial Athletic Association. Get someone like Lou Spanos in charge of their football program and give them some extra cash and the upgrade is possible.
A few problems here... part of the lease prohibits "money losing" events from being run right now (because then UConn's required subsidy of the stadiums operating expenses would be used to support non-UConn entities). Estimates from UConn have said they need about 20k in attendance to break even on running an event at the stadium.
Just two FCS schools (Jackson St. & Montana) averaged enough fans to make playing at Rentschler Field profitable. Yale was 13th in FCS with 12,133 per game. You can make the top 25 in average FCS attendance with 9500 fans... Rentschler Field is not viable as a home field for any other college in the state of Connecticut.
Central currently plays in 5500 seat stadium. They don't sell it out.
Neither Maine nor URI would travel in enough numbers to get the Rent to 20k to break even.
You could pretend that Maine sells out all 10,000 seats at Alfond Field and then you'd need to assume that not only does CCSU develop a fanbase that sells out their stadium, they double that fanbase AND Maine then brought every fan that would fill Alfond Field and you might have a profitable game at the Rent for CCSU.