The MVC is still the #8 conference in RPI, but they have closed the gap between them and the #7 conference, the Atlantic 10, which is not participating in BracketBusters.
http://realtimerpi.com/rpi_conf_Men.html
The MVC is too far ahead of the #9 conference, the Pac 12, to fall to 9th, and too far behind the #6 conference, the ACC, to get that high. But with a very good BracketBusters weekend, I'd estimate 8, 9, or possibly 10 wins, the MVC could move into the 7th slot in RPI. It will be difficult because 8 of the 10 MVC teams are playing down in RPI matchups, and the only 2 that are playing up, it is a small difference (see 3 posts above).
BTW, once the BracketBusters games are over, the conference RPIs will not change significantly, since they will only play each other.