while it sounds large, it would only be an extra weekend for most top teams...8 rounds plus a "play in round" to get from 250->256.
I don't think it particularly unmanageable from a logistics perspective. play the first round at a home site, then the extra two rounds at the home site of highest seeded team in the pod, then you're down to the standard 64.
Or they could keep with tradition and play the extra 300 games at dayton.