I haven't seen anybody post anything on this so I figured I would let people know about it. Rpiforecast.com has created something called the RPI Wizard and it allows you to enter outcomes of a game for your team just to see where the projected RPI would be. I ran a simulation of WSU going undefeated....here are the results.
Wichita St- 30-0 RPI: 5 SOS: 104
It's hard to imagine them going undefeated and only jumping up one spot in the RPI, but the SOS is too low to jump any of the top 5 without a few losses.
http://www.rpiforecast.com/wizard/index.html