There are exactly 70 bowl eligible teams to fill the 70 spots. There will be no need to fill in with some 5-7 team or teams. Four teams can still get eligible next week, I expect one will. In order of how likely they are to win:
Washington vs Washington St in the crapple cup.
MTSU vs FIU. FIU has clinched the Sun Belt title, so that might give MTSU a chance.
La Tech vs Nevada. Yeah, not happening.
Oregon St vs Oregon. See above, only more so. Well, it is a rivalry, so maybe its a bit more likely.
If Washington wins (Im ignoring the other possibilities), Western Michigan is probably the 6-6 team that gets to stay home. If somehow Oregon St also wins, it might be Louisville that gets left out, but not sure with some of the changes in rules, might be another MAC team staying home.