I don't know Roy. The Mountain West had an outstanding year last year and a good one the year before but historically it is a very weak conference. Adding Boise State would be key but the Big East has always been a much stronger conference and with teams in big cities has better recruiting bases to start with.
Also, Kansas and Kansas State are more basketball schools and the Big East is one of the top 2-3 conferences in the country, easily.
If the Mountain West can get Boise State and maybe steal someone from another conference that has a good football program, then maybe they get the Big 12 bid to the BCS but a seriously doubt it.
The BCS wants the elite teams and if the power conferences get deeper, I see them dropping the Big 12 bids, adding more at large bids and offering up to 3 bids to each power conference. That way they could get Texas, USC and Oregon from the PAC 10 and/or Nebraska, Ohio State and Penn State from the Big 10 and/or Florida, Alabama and Tennessee from the SEC if that's where the best teams are that year.