Zone plan is the Top 6 ranked conference champs(of any conference I believe) from the BCS standings. Top 2 ranked teams get a bye.
I was using 4 as an example.
Even still. Use the Top 8 teams in the BCS and you only have 4 conferences in. 3 SEC teams, 2 Big 12, 2 Pac 12, and The MWC.
You're cutting out from the BCS conference's: The Big East, ACC, and Big 10. I really doubt the conferences get behind a system that would/could leave at least 3 of the big money making conferences out in the cold.
I'm thinking the BCS conferences will get behind only a system that promises them a slot. Hence why I think a variation of the 6 team model that ZB makes sense and is practical. Maybe expand it to 8 so you have two at larges...roll from there.
6 BCS conference champs. Two at large spots. Go.