6 (or more) from the Big 10 is always a possibility, and I agree that the Pac 10's struggles will open up some extra bids. But if there's one conference that will benefit the most from the Pac 10's woes, I think it'll be the A-10. I'm seeing a minimum of 3 bids (and maybe 4-5) for the A-10. Dayton, Rhode Island, Richmond and Temple have already positioned themselves nicely, and I wouldn't count out Xavier, Charlotte and LaSalle (in that order) if they have strong A-10 seasons.
The other thing to remember is, last year was a really weak year for non-BCS leagues. There just weren't that many viable at-large candidates; not many of 'em did much outside of their leagues. This year that doesn't appear to be the case. In addition to the A-10, the Colonial (ODU, VCU, William & Mary), Conference USA (Memphis, Tulsa), Missouri Valley (Missouri State, Northern Iowa, Wichita State), Mountain West (BYU, New Mexico, San Diego State, UNLV) and WCC (Gonzaga, Portland, St. Mary's) all appear capable of receiving more bids than last season.