I'd much rather rejoin the MAC than stay in the, even further watered down C-USA. As for joining the Sunbelt, that's a step up from the MAC but, in my opinion, it's a short step. Leaving the MAC for C-USA was not a well thought out decision and has probably cost Marshall tons of money throughout the years. The visions of grandeur that our leadership had back in 2005 did not pan out like they expected and we are now paying the price for that. My vote is joining the AAC if it is offered up and if not, begging the MAC to take us back.
I've seen people post things like this and its just flat not true. Let me break it down - at the time Marshall was being courted by C-USA, the MAC was paying its member institutions $35,000 a year in media rights fees. That's right... $35k. C-USA was paying its members about $1.4 million each. Marshall knew that travel costs would eat into that, but estimated that those travel costs would be somewhere between $400-600k, leaving between $800k and $1,000,000 in extra money for MU's athletic programs. Not chump change, but certainly low enough that Marshall didn't just jump to change conferences because of the extra money.
Here's the kicker - at the time Marshall was contemplating moving, the NCAA had passed a rule that schools that didn't average $15k in attendance could not remain FBS. There were 4-5 MAC schools that were looking at, in effect, relegation to 1-AA. Kent, Akron, Buffalo, Eastern Michigan and Central Michigan were all hovering or way below that threshold. There was a very real fear the MAC was going to disintegrate because of this new rule, so that tipped the scales about whether MU would go or not. Subsequently, the NCAA let schools count (in effect) neutral games as part of the attendance calculations so Akron (Army), Kent (Boston College), Bowling Green (Wisconsin) and Toledo (Ohio State) all "hosted" games at Cleveland Browns Stadium. Miami hosted Kentucky in Paul Brown Stadium in Cincy for the same benefit. Eventually, the NCAA did away with the 'rule' and now those schools still in large part draw flies to their home games (Akron drew <9000 for its home game vs. Bryant last Saturday).
Also keep in mind that C-USA today isn't nearly what C-USA was when MU agreed to join. I can't say that the powers that be didn't anticipate that other members of C-USA would be leaving before MU's move was finalized, but when Marshall signed on the proverbial dotted line, C-USA still had Cincy, Louisville and South Florida as members, and DePaul and Marquette were still in the conference for basketball.
To say that Marshall didn't think a move through to its current conference is just silly.