Several of the suggestions here would really diminish the stature of the MACCG.
First, playing at Crew or the new soccer stadium (if possible). Playing on a make-shift football field would really lend a HS atmosphere to the game. Some HS regional games were played at Crew stadium a couple weeks ago, and no college FB games have been played there in years. Plus, there's a reason the B10 doesn't play at an outdoor stadium in December -- weather. Moving to Canton isn't doable for the weather reason plus the OHSAA plays its six HS championships there the first weekend in December. That probably gets the venue more cash than the one MACCG would.
Second, play at the home field of the higher seed. Again, weather. But also, the crowd would be overwhelmingly a home team crowd. I just watched the North Texas-UTSA game from San Antonio and it was about 90% UTSA fans. It was the same way when T'erd hosted all those MACCG earlier this century, and I think they won all but one of the five or so they were in. At least Detroit is more centrally located for MAC schools and fans.
The main problem is the smaller crowds relative to the venue. The games usually draw 12.000-20,000 with the smallest being about 9,000 and the biggest 45,000 (when WMU was ranked). That could be a matter of timing. One or both champions usually aren't decided until the last week of the season, so there's little time for fans to get tickets and arrange travel. One solution might be to start the season during the so-called "Week 0" and finish the Saturday before Thanksgiving. That would give fans some extra time to get involved.
We will get by.
We will get by.
We will get by.
We will survive.