When the C7 left they needed the votes of two FBS schools to dissolve the conference (part of the bylaws to keep both "sides" protected). The only voting FBS members left at that point were UConn, Cincinnati & USF.
To dissolve completely the C7 probably would've had to include UConn & Cincinnati, with both of those schools needing to find a favorable home for their football programs. Absent that, there's not a way that the schools could've voted, without killing football, which wasn't a viable option for Cincinnati (or USF, if someone tried to make them the second FBS school)... as a result, it was never going to happen, which is why things went they way they did.
The alternate history had that somehow come to fruition would've been interesting... as the majority of conferences had already backfilled the schools they lost. C-USA for example was already back to 12, MWC which had flirted with Houston & SMU as things were going bad for the Big East/AAC had ended up filling to 10 holding the spots for Boise State & San Diego State that they ended up taking. The only conference that had obvious openings was the Sun Belt, which was likely unacceptable to most members. As a result, Houston, SMU, Tulane, Memphis, ECU, UCF, USF would've been looking for new all sport homes and may have still created their own conference. Presumably Temple could've gone back to MAC (which was at 13 but had hoped to be 14 when UMass joined)/A10 (backfilling the newly joined Butler who likely would've been the C7+UConn & Cincy #10) & Navy goes back to Independent. Bad-blood after UConn and Cincy had torched the conference plans of the leftover schools, leaving them with few good options may well have blocked the two of them from the solution the leftover schools came up with.