I think there is still hope for a MAC team in DC. Conference USA has 7 bowl tie-ins, that means that all 3 of the teams that are currently 4-5 have to go 6-6 to fill all of their slots. Also Navy maybe not be eligible sitting at 6-6. I think Ohio can make a compelling argument we will travel well to DC, cheap flights, driveable, active DC alumni group.
CUSA actually has four 4-5 teams (Terd, ECU, UCF and UTEP) and a 3-6 team (Rice). But the 4-5 teams all play one another and/or have tough games along the way. Terd is at Tulsa (6-3), at Memphis and has ECU at home; ECU is also at UTEP and home to UCF; UCF also is at Southern Miss (8-1) and home to UTEP; UTEP also has Tulsa at home. They could all basically eliminate each other, under the right circumstances. Rice is at Northwestern, home to Tulane and at Southern Methodist. Doesn't look promising for them either.
Even the WAC -- the only conference without any bowl-eligible teams -- may have trouble filling its three bowl spots. It has three 5-win teams, one 3-5 team and three 3-6 teams. It likely won't get more than three eligible teams. That could mean some nice slots for even 7-win MAC teams.