DI-FBS in football. Primarily because the FCS allows DI schools to participate in non-scholarship football (i.e. Ivy League and Pioneer Football League). While the FBS currently does not allow it for various reasons. So the best anyone can probably hope for is for the Ivy League to dominant the DI-FCS part of DI football. Now that isn't to say an Ivy League team could end agreeing to play a SEC team during the regular season. However, I don't see that happening any time soon for a number of reasons.