I think the biggest change won't be WSU, which probably will relatively similar to last year, but the rest of the Valley. We replace Creighton with a team that probably will finish in the 7-8 range next year, and many teams lose their best players. Evansville minus Colt Ryan, Illinois State minus Charmichael and Brown, etc.
The Valley as a whole will probably be down. Indiana State should be a better version of their 2012-2013 team, with few line-up changes, though the consistency problems remain. Aside from them and Wichita State, every team in the upper half of the Valley is going to be down, and Bradley and MSU will have to improve significantly to be a factor in the Valley title race.
That means the gap between 1 and 2 will be a lot bigger than it was this year, where Illinois State, UNI, Evansville, and Indiana State were all competitive with Creighton and Wichita State. Would not surprise me to see a lot of teams at 9-9 or 8-10 with the two top teams closer to 13-3 and 14-2.