FWIW it was reported in the DNR that JMU and Delaware both
had discussions with the MAC at some point. I believe it was prior to UMass joining the conference as a football-only member. It wasn't clear if it would have been full membership or football-only membership. It is my understanding that Delaware killed the plan because they weren't ready to give up their football rivalry with Villanova.
It is possible the fans would eventually warm up to JMU being in the Sun Belt. I do think JMU could do well in the Sun Belt. What would be interesting to see is the impact (if any) the Sun Belt membership has on JMU's out-of-state students demographics. More specifically would JMU see a decline in interest in students from the Mid-Atlantic Region and New England Region if JMU decided to join the Sun Belt either as a full or football-only member.